diff --git a/benchmark/src/main/java/org/capnproto/benchmark/TestCase.java b/benchmark/src/main/java/org/capnproto/benchmark/TestCase.java
index e74f336..a3cb29c 100644
--- a/benchmark/src/main/java/org/capnproto/benchmark/TestCase.java
+++ b/benchmark/src/main/java/org/capnproto/benchmark/TestCase.java
@@ -11,10 +11,13 @@ import org.capnproto.StructFactory;
 import org.capnproto.MessageBuilder;
 import org.capnproto.MessageReader;
 
-public abstract class TestCase<RequestFactory extends StructFactory<RequestBuilder, RequestReader>,
-                          RequestBuilder, RequestReader,
+public abstract class TestCase<RequestFactory extends
+                          StructFactory<RequestBuilder, RequestReader>,
+                          RequestBuilder extends org.capnproto.StructBuilder,
+                          RequestReader extends org.capnproto.StructReader,
                           ResponseFactory extends StructFactory<ResponseBuilder, ResponseReader>,
-                          ResponseBuilder, ResponseReader, Expectation> {
+                          ResponseBuilder extends org.capnproto.StructBuilder,
+                          ResponseReader extends org.capnproto.StructReader, Expectation> {
     public abstract Expectation setupRequest(Common.FastRand rng, RequestBuilder request);
     public abstract void handleRequest(RequestReader request, ResponseBuilder response);
     public abstract boolean checkResponse(ResponseReader response, Expectation expected);
diff --git a/compiler/src/main/cpp/capnpc-java.c++ b/compiler/src/main/cpp/capnpc-java.c++
index fd542ec..29afea3 100644
--- a/compiler/src/main/cpp/capnpc-java.c++
+++ b/compiler/src/main/cpp/capnpc-java.c++
@@ -763,7 +763,7 @@ private:
                     ");\n");
                 case Section::POINTERS:
                   return kj::strTree(
-                    spaces(indent), "    _getPointerField(", slot.offset, ").clear();\n");
+                    spaces(indent), "    _clearPointerField(", slot.offset, ");\n");
                 }
                 KJ_UNREACHABLE;
               },
@@ -947,20 +947,20 @@ private:
         kj::strTree(
             kj::mv(unionDiscrim.builderIsDecl),
             spaces(indent), "  public final boolean has", titleCase, "() {\n",
-            spaces(indent), "    return !_getPointerField(", offset, ").isNull();\n",
+            spaces(indent), "    return !_pointerFieldIsNull(", offset, ");\n",
             spaces(indent), "  }\n",
 
             spaces(indent), "  public org.capnproto.AnyPointer.Builder get", titleCase, "() {\n",
             unionDiscrim.check,
-            spaces(indent), "    return new org.capnproto.AnyPointer.Builder(_getPointerField(",
-            offset, "));\n",
+            spaces(indent), "    return new org.capnproto.AnyPointer.Builder(this.segment, this.pointers + ",
+            offset, ");\n",
             spaces(indent), "  }\n",
 
             spaces(indent), "  public org.capnproto.AnyPointer.Builder init", titleCase, "() {\n",
             unionDiscrim.set,
             spaces(indent), "    org.capnproto.AnyPointer.Builder result =\n",
-            spaces(indent), "      new org.capnproto.AnyPointer.Builder(_getPointerField(",
-            offset, "));\n",
+            spaces(indent), "      new org.capnproto.AnyPointer.Builder(this.segment, this.pointers +",
+            offset, ");\n",
             spaces(indent), "    result.clear();\n",
             spaces(indent), "    return result;\n",
             spaces(indent), "  }\n",
@@ -994,7 +994,7 @@ private:
           spaces(indent), "  }\n",
           spaces(indent), "  public final void set", titleCase, "(", type, ".Reader value) {\n",
           unionDiscrim.set,
-          spaces(indent), "    _getPointerField(", offset, ").setStruct(value);\n",
+          spaces(indent), "    _setPointerField(", type, ".factory,", offset, ", value);\n",
           spaces(indent), "  }\n",
           spaces(indent), "  public final ", type, ".Builder init", titleCase, "() {\n",
           unionDiscrim.set,
@@ -1031,7 +1031,7 @@ private:
           kj::mv(unionDiscrim.builderIsDecl),
           spaces(indent), "  public final boolean has", titleCase, "() {\n",
           unionDiscrim.has,
-          spaces(indent), "    return !_getPointerField(", offset, ").isNull();\n",
+          spaces(indent), "    return !_pointerFieldIsNull(", offset, ");\n",
           spaces(indent), "  }\n",
           spaces(indent), "  public final ", type, ".Builder get", titleCase, "() {\n",
           spaces(indent), "    return _getPointerField(", factory, ", ",
@@ -1039,11 +1039,11 @@ private:
           spaces(indent), "  }\n",
           spaces(indent), "  public final void set", titleCase, "(", type, ".Reader value) {\n",
           unionDiscrim.set,
-          spaces(indent), "    _getPointerField(", offset, ").set", blobKind, "(value);\n",
+          spaces(indent), "    _setPointerField(", factory, ", ", offset, ", value);\n",
           spaces(indent), "  }\n",
           spaces(indent), "  public final void set", titleCase, "(", setterInputType, " value) {\n",
           unionDiscrim.set,
-          spaces(indent), "    _getPointerField(", offset, ").set", blobKind, "( new",
+          spaces(indent), "    _setPointerField(", factory, ", ", offset, ", new",
           type, ".Reader(value));\n",
           spaces(indent), "  }\n",
 
@@ -1077,7 +1077,7 @@ private:
         kj::strTree(
             kj::mv(unionDiscrim.builderIsDecl),
             spaces(indent), "  public final boolean has", titleCase, "() {\n",
-            spaces(indent), "    return !_getPointerField(", offset, ").isNull();\n",
+            spaces(indent), "    return !_pointerFieldIsNull(", offset, ");\n",
             spaces(indent), "  }\n",
 
             spaces(indent), "  public final ", builderClass,
@@ -1086,7 +1086,7 @@ private:
             spaces(indent), "  }\n",
 
             spaces(indent), "  public final void set", titleCase, "(", readerClass, " value) {\n",
-            spaces(indent), "    _getPointerField(", offset, ").setList(value);\n",
+            spaces(indent), "    _setPointerField(", listFactory, ", ", offset, ", value);\n",
             spaces(indent), "  }\n",
 
             spaces(indent), "  public final ", builderClass,
diff --git a/runtime/src/main/java/org/capnproto/AnyPointer.java b/runtime/src/main/java/org/capnproto/AnyPointer.java
index 09e81e1..8df2e64 100644
--- a/runtime/src/main/java/org/capnproto/AnyPointer.java
+++ b/runtime/src/main/java/org/capnproto/AnyPointer.java
@@ -19,22 +19,25 @@ public final class AnyPointer {
     }
 
     public static final class Builder {
-        public final PointerBuilder builder;
+        final SegmentBuilder segment;
+        final int pointer;
 
-        public Builder(PointerBuilder builder) {
-            this.builder = builder;
+        public Builder(SegmentBuilder segment, int pointer) {
+            this.segment = segment;
+            this.pointer = pointer;
         }
 
         public final <T> T initAs(InitFromPointerBuilder<T> factory) {
-            return factory.initFromPointerBuilder(this.builder.segment, this.builder.pointer);
+            return factory.initFromPointerBuilder(this.segment, this.pointer);
         }
 
         public final <T> T initAs(InitSizedFromPointerBuilder<T> factory, int elementCount) {
-            return factory.initSizedFromPointerBuilder(this.builder.segment, this.builder.pointer, elementCount);
+            return factory.initSizedFromPointerBuilder(this.segment, this.pointer, elementCount);
         }
 
         public final void clear() {
-            this.builder.clear();
+            WireHelpers.zeroObject(this.segment, this.pointer);
+            this.segment.buffer.putLong(this.pointer * 8, 0L);
         }
     }
 
diff --git a/runtime/src/main/java/org/capnproto/Data.java b/runtime/src/main/java/org/capnproto/Data.java
index 515a08e..ec0df65 100644
--- a/runtime/src/main/java/org/capnproto/Data.java
+++ b/runtime/src/main/java/org/capnproto/Data.java
@@ -5,12 +5,13 @@ import java.nio.ByteBuffer;
 public final class Data {
     public static final class Factory implements FromPointerReaderBlobDefault<Reader>,
                                       FromPointerBuilderBlobDefault<Builder>,
+                                      SetPointerBuilder<Reader>,
                                       InitSizedFromPointerBuilder<Builder> {
-        public Reader fromPointerReaderBlobDefault(SegmentReader segment, int pointer, java.nio.ByteBuffer defaultBuffer,
+        public final Reader fromPointerReaderBlobDefault(SegmentReader segment, int pointer, java.nio.ByteBuffer defaultBuffer,
                                                    int defaultOffset, int defaultSize) {
             return WireHelpers.readDataPointer(segment, pointer, defaultBuffer, defaultOffset, defaultSize);
         }
-        public Builder fromPointerBuilderBlobDefault(SegmentBuilder segment, int pointer,
+        public final Builder fromPointerBuilderBlobDefault(SegmentBuilder segment, int pointer,
                                                      java.nio.ByteBuffer defaultBuffer, int defaultOffset, int defaultSize) {
             return WireHelpers.getWritableDataPointer(pointer,
                                                       segment,
@@ -19,9 +20,13 @@ public final class Data {
                                                       defaultSize);
         }
 
-        public Builder initSizedFromPointerBuilder(SegmentBuilder segment, int pointer, int size) {
+        public final Builder initSizedFromPointerBuilder(SegmentBuilder segment, int pointer, int size) {
             return WireHelpers.initDataPointer(pointer, segment, size);
         }
+
+        public final void setPointerBuilder(SegmentBuilder segment, int pointer, Reader value) {
+            WireHelpers.setDataPointer(pointer, segment, value);
+        }
     }
     public static final Factory factory = new Factory();
 
diff --git a/runtime/src/main/java/org/capnproto/DataList.java b/runtime/src/main/java/org/capnproto/DataList.java
index 7e8cd9e..7a4055e 100644
--- a/runtime/src/main/java/org/capnproto/DataList.java
+++ b/runtime/src/main/java/org/capnproto/DataList.java
@@ -69,7 +69,7 @@ public final class DataList {
         }
 
         public final void set(int index, Data.Reader value) {
-            _getPointerElement(index).setData(value);
+            _setPointerElement(Data.factory, index, value);
         }
 
         public final class Iterator implements java.util.Iterator<Data.Builder> {
diff --git a/runtime/src/main/java/org/capnproto/ListBuilder.java b/runtime/src/main/java/org/capnproto/ListBuilder.java
index 64a96e9..35f8ae1 100644
--- a/runtime/src/main/java/org/capnproto/ListBuilder.java
+++ b/runtime/src/main/java/org/capnproto/ListBuilder.java
@@ -104,13 +104,6 @@ public class ListBuilder {
                                         (byte)(indexBit % 8));
     }
 
-
-    protected final PointerBuilder _getPointerElement(int index) {
-        return new PointerBuilder(
-            this.segment,
-            (this.ptr + (index * this.step / Constants.BITS_PER_BYTE)) / Constants.BYTES_PER_WORD);
-    }
-
     protected final <T> T _getPointerElement(FromPointerBuilder<T> factory, int index, SegmentReader defaultSegment, int defaultOffset) {
         return factory.fromPointerBuilder(
             this.segment,
@@ -139,4 +132,11 @@ public class ListBuilder {
             (this.ptr + (index * this.step / Constants.BITS_PER_BYTE)) / Constants.BYTES_PER_WORD,
             elementCount);
     }
+
+    protected final <Reader> void _setPointerElement(SetPointerBuilder<Reader> factory, int index, Reader value) {
+        factory.setPointerBuilder(this.segment,
+                                  (this.ptr + (index * this.step / Constants.BITS_PER_BYTE)) / Constants.BYTES_PER_WORD,
+                                  value);
+    }
+
 }
diff --git a/runtime/src/main/java/org/capnproto/ListFactory.java b/runtime/src/main/java/org/capnproto/ListFactory.java
index b7c9c19..bf28be7 100644
--- a/runtime/src/main/java/org/capnproto/ListFactory.java
+++ b/runtime/src/main/java/org/capnproto/ListFactory.java
@@ -1,8 +1,11 @@
 package org.capnproto;
 
-public abstract class ListFactory<Builder, Reader> implements ListBuilder.Factory<Builder>, FromPointerBuilder<Builder>,
-                                              InitSizedFromPointerBuilder<Builder>,
-                                              ListReader.Factory<Reader>, FromPointerReader<Reader> {
+public abstract class ListFactory<Builder, Reader extends ListReader>
+    implements ListBuilder.Factory<Builder>, FromPointerBuilder<Builder>,
+    InitSizedFromPointerBuilder<Builder>,
+    SetPointerBuilder<Reader>,
+    ListReader.Factory<Reader>, FromPointerReader<Reader> {
+
     final byte elementSize;
     ListFactory(byte elementSize) {this.elementSize = elementSize;}
 
@@ -30,4 +33,8 @@ public abstract class ListFactory<Builder, Reader> implements ListBuilder.Factor
     public Builder initSizedFromPointerBuilder(SegmentBuilder segment, int pointer, int elementCount) {
         return WireHelpers.initListPointer(this, pointer, segment, elementCount, this.elementSize);
     }
+
+    public final void setPointerBuilder(SegmentBuilder segment, int pointer, Reader value) {
+        WireHelpers.setListPointer(segment, pointer, value);
+    }
 }
diff --git a/runtime/src/main/java/org/capnproto/ListList.java b/runtime/src/main/java/org/capnproto/ListList.java
index 12b8ffd..9abb7b8 100644
--- a/runtime/src/main/java/org/capnproto/ListList.java
+++ b/runtime/src/main/java/org/capnproto/ListList.java
@@ -1,7 +1,7 @@
 package org.capnproto;
 
 public final class ListList {
-    public static final class Factory<ElementBuilder, ElementReader>
+    public static final class Factory<ElementBuilder, ElementReader extends ListReader>
         extends ListFactory<Builder<ElementBuilder>, Reader<ElementReader>> {
 
         public final ListFactory<ElementBuilder, ElementReader> factory;
diff --git a/runtime/src/main/java/org/capnproto/MessageBuilder.java b/runtime/src/main/java/org/capnproto/MessageBuilder.java
index 129001e..3ca90ef 100644
--- a/runtime/src/main/java/org/capnproto/MessageBuilder.java
+++ b/runtime/src/main/java/org/capnproto/MessageBuilder.java
@@ -30,7 +30,7 @@ public final class MessageBuilder {
             throw new Error("could not allocate root pointer");
         }
 
-        AnyPointer.Builder ptr = new AnyPointer.Builder(PointerBuilder.getRoot(rootSegment, location));
+        AnyPointer.Builder ptr = new AnyPointer.Builder(rootSegment, location);
         return ptr.initAs(factory);
     }
 
diff --git a/runtime/src/main/java/org/capnproto/PointerBuilder.java b/runtime/src/main/java/org/capnproto/PointerBuilder.java
deleted file mode 100644
index c5b1442..0000000
--- a/runtime/src/main/java/org/capnproto/PointerBuilder.java
+++ /dev/null
@@ -1,40 +0,0 @@
-package org.capnproto;
-
-public final class PointerBuilder {
-    final SegmentBuilder segment;
-    final int pointer; // word offset
-
-    public PointerBuilder(SegmentBuilder segment, int pointer) {
-        this.segment = segment;
-        this.pointer = pointer;
-    }
-
-    public static PointerBuilder getRoot(SegmentBuilder segment, int location) {
-        return new PointerBuilder(segment, location);
-    }
-
-    public final boolean isNull() {
-        return this.segment.buffer.getLong(this.pointer) == 0;
-    }
-
-    public final void setList(ListReader value) {
-        WireHelpers.setListPointer(this.segment, this.pointer, value);
-    }
-
-    public final void setStruct(StructReader value) {
-        WireHelpers.setStructPointer(this.segment, this.pointer, value);
-    }
-
-    public final void setText(Text.Reader value) {
-        WireHelpers.setTextPointer(this.pointer, this.segment, value);
-    }
-
-    public final void setData(Data.Reader value) {
-        WireHelpers.setDataPointer(this.pointer, this.segment, value);
-    }
-
-    public final void clear() {
-        WireHelpers.zeroObject(this.segment, this.pointer);
-        this.segment.buffer.putLong(this.pointer * 8, 0L);
-    }
-}
diff --git a/runtime/src/main/java/org/capnproto/SetPointerBuilder.java b/runtime/src/main/java/org/capnproto/SetPointerBuilder.java
new file mode 100644
index 0000000..575956f
--- /dev/null
+++ b/runtime/src/main/java/org/capnproto/SetPointerBuilder.java
@@ -0,0 +1,5 @@
+package org.capnproto;
+
+public interface SetPointerBuilder<Reader> {
+    void setPointerBuilder(SegmentBuilder segment, int pointer, Reader value);
+}
diff --git a/runtime/src/main/java/org/capnproto/StructBuilder.java b/runtime/src/main/java/org/capnproto/StructBuilder.java
index 3a34962..578e89a 100644
--- a/runtime/src/main/java/org/capnproto/StructBuilder.java
+++ b/runtime/src/main/java/org/capnproto/StructBuilder.java
@@ -149,8 +149,14 @@ public class StructBuilder {
                                     Double.doubleToLongBits(value) ^ mask);
     }
 
-    protected final PointerBuilder _getPointerField(int index) {
-        return new PointerBuilder(this.segment, this.pointers + index);
+    protected final boolean _pointerFieldIsNull(int ptrIndex) {
+        return this.segment.buffer.getLong((this.pointers + ptrIndex) * Constants.BYTES_PER_WORD) == 0;
+    }
+
+    protected final void _clearPointerField(int ptrIndex) {
+        int pointer = this.pointers + ptrIndex;
+        WireHelpers.zeroObject(this.segment, pointer);
+        this.segment.buffer.putLong(pointer * 8, 0L);
     }
 
     protected final <T> T _getPointerField(FromPointerBuilder<T> factory, int index, SegmentReader defaultSegment, int defaultOffset) {
@@ -170,4 +176,8 @@ public class StructBuilder {
         return factory.initSizedFromPointerBuilder(this.segment, this.pointers + index, elementCount);
     }
 
+    protected final <Reader> void _setPointerField(SetPointerBuilder<Reader> factory, int index, Reader value) {
+        factory.setPointerBuilder(this.segment, this.pointers + index, value);
+    }
+
 }
diff --git a/runtime/src/main/java/org/capnproto/StructFactory.java b/runtime/src/main/java/org/capnproto/StructFactory.java
index 29ff4be..6a84916 100644
--- a/runtime/src/main/java/org/capnproto/StructFactory.java
+++ b/runtime/src/main/java/org/capnproto/StructFactory.java
@@ -1,8 +1,10 @@
 package org.capnproto;
 
-public abstract class StructFactory<Builder, Reader> implements FromPointerBuilder<Builder>, StructBuilder.Factory<Builder>,
-                                                     InitFromPointerBuilder<Builder>,
-                                                     FromPointerReader<Reader>, StructReader.Factory<Reader> {
+public abstract class StructFactory<Builder, Reader extends StructReader>
+    implements FromPointerBuilder<Builder>, StructBuilder.Factory<Builder>,
+    InitFromPointerBuilder<Builder>,
+    SetPointerBuilder<Reader>,
+    FromPointerReader<Reader>, StructReader.Factory<Reader> {
     public final Reader fromPointerReader(SegmentReader segment, int pointer,
                                           SegmentReader defaultSegment, int defaultOffset,
                                           int nestingLimit) {
@@ -20,5 +22,9 @@ public abstract class StructFactory<Builder, Reader> implements FromPointerBuild
         return WireHelpers.initStructPointer(this, pointer, segment, this.structSize());
     }
 
+    public final void setPointerBuilder(SegmentBuilder segment, int pointer, Reader value) {
+        WireHelpers.setStructPointer(segment, pointer, value);
+    }
+
     public abstract Reader asReader(Builder builder);
 }
diff --git a/runtime/src/main/java/org/capnproto/StructList.java b/runtime/src/main/java/org/capnproto/StructList.java
index 9751d8f..73cc7a0 100644
--- a/runtime/src/main/java/org/capnproto/StructList.java
+++ b/runtime/src/main/java/org/capnproto/StructList.java
@@ -1,7 +1,7 @@
 package org.capnproto;
 
 public final class StructList {
-    public static final class Factory<ElementBuilder, ElementReader>
+    public static final class Factory<ElementBuilder extends StructBuilder, ElementReader extends StructReader>
         extends ListFactory<Builder<ElementBuilder>, Reader<ElementReader>> {
 
         public final StructFactory<ElementBuilder, ElementReader> factory;
diff --git a/runtime/src/main/java/org/capnproto/StructReader.java b/runtime/src/main/java/org/capnproto/StructReader.java
index d73e6cd..3207e6f 100644
--- a/runtime/src/main/java/org/capnproto/StructReader.java
+++ b/runtime/src/main/java/org/capnproto/StructReader.java
@@ -136,7 +136,7 @@ public class StructReader {
     }
 
     protected final boolean _pointerFieldIsNull(int ptrIndex) {
-        return this.segment.buffer.getLong(this.pointers + ptrIndex) == 0;
+        return this.segment.buffer.getLong((this.pointers + ptrIndex) * Constants.BYTES_PER_WORD) == 0;
     }
 
     protected final <T> T _getPointerField(FromPointerReader<T> factory, int ptrIndex, SegmentReader defaultSegment, int defaultOffset) {
diff --git a/runtime/src/main/java/org/capnproto/Text.java b/runtime/src/main/java/org/capnproto/Text.java
index df6f3bc..d1ac749 100644
--- a/runtime/src/main/java/org/capnproto/Text.java
+++ b/runtime/src/main/java/org/capnproto/Text.java
@@ -5,13 +5,14 @@ import java.nio.ByteBuffer;
 public final class Text {
     public static final class Factory implements FromPointerReaderBlobDefault<Reader>,
                                       FromPointerBuilderBlobDefault<Builder>,
+                                      SetPointerBuilder<Reader>,
                                       InitSizedFromPointerBuilder<Builder> {
-        public Reader fromPointerReaderBlobDefault(SegmentReader segment, int pointer, java.nio.ByteBuffer defaultBuffer,
+        public final Reader fromPointerReaderBlobDefault(SegmentReader segment, int pointer, java.nio.ByteBuffer defaultBuffer,
                                                    int defaultOffset, int defaultSize) {
             return WireHelpers.readTextPointer(segment, pointer, defaultBuffer, defaultOffset, defaultSize);
         }
 
-        public Builder fromPointerBuilderBlobDefault(SegmentBuilder segment, int pointer,
+        public final Builder fromPointerBuilderBlobDefault(SegmentBuilder segment, int pointer,
                                                      java.nio.ByteBuffer defaultBuffer, int defaultOffset, int defaultSize) {
             return WireHelpers.getWritableTextPointer(pointer,
                                                       segment,
@@ -20,9 +21,13 @@ public final class Text {
                                                       defaultSize);
         }
 
-        public Builder initSizedFromPointerBuilder(SegmentBuilder segment, int pointer, int size) {
+        public final Builder initSizedFromPointerBuilder(SegmentBuilder segment, int pointer, int size) {
             return WireHelpers.initTextPointer(pointer, segment, size);
         }
+
+        public final void setPointerBuilder(SegmentBuilder segment, int pointer, Reader value) {
+            WireHelpers.setTextPointer(pointer, segment, value);
+        }
     }
     public static final Factory factory = new Factory();
 
diff --git a/runtime/src/main/java/org/capnproto/TextList.java b/runtime/src/main/java/org/capnproto/TextList.java
index b994ee5..844ced1 100644
--- a/runtime/src/main/java/org/capnproto/TextList.java
+++ b/runtime/src/main/java/org/capnproto/TextList.java
@@ -69,7 +69,7 @@ public final class TextList {
         }
 
         public final void set(int index, Text.Reader value) {
-            _getPointerElement(index).setText(value);
+            _setPointerElement(Text.factory, index, value);
         }
 
         public final class Iterator implements java.util.Iterator<Text.Builder> {
diff --git a/runtime/src/test/scala/org/capnproto/LayoutTest.scala b/runtime/src/test/scala/org/capnproto/LayoutTest.scala
index 729378e..3070b98 100644
--- a/runtime/src/test/scala/org/capnproto/LayoutTest.scala
+++ b/runtime/src/test/scala/org/capnproto/LayoutTest.scala
@@ -114,12 +114,10 @@ class LayoutSuite extends FunSuite {
     val buffer = java.nio.ByteBuffer.allocate(1024 * 8);
     buffer.order(java.nio.ByteOrder.LITTLE_ENDIAN);
 
-    val pointerBuilder = PointerBuilder.getRoot(
-      new SegmentBuilder(buffer, new BuilderArena(BuilderArena.SUGGESTED_FIRST_SEGMENT_WORDS,
-                                                  BuilderArena.SUGGESTED_ALLOCATION_STRATEGY)),
-      0);
+    val segment = new SegmentBuilder(buffer, new BuilderArena(BuilderArena.SUGGESTED_FIRST_SEGMENT_WORDS,
+                                                              BuilderArena.SUGGESTED_ALLOCATION_STRATEGY))
     val factory = new BareStructBuilder(new StructSize(2, 4, FieldSize.INLINE_COMPOSITE));
-    val builder =  WireHelpers.initStructPointer(factory, pointerBuilder.pointer, pointerBuilder.segment, factory.structSize());
+    val builder =  WireHelpers.initStructPointer(factory, 0, segment, factory.structSize());
     setupStruct(builder);
     checkStruct(builder);
   }