diff --git a/runtime/src/main/java/org/capnproto/FromPointerBuilder.java b/runtime/src/main/java/org/capnproto/FromPointerBuilder.java
index be4b382..8369334 100644
--- a/runtime/src/main/java/org/capnproto/FromPointerBuilder.java
+++ b/runtime/src/main/java/org/capnproto/FromPointerBuilder.java
@@ -1,9 +1,6 @@
 package org.capnproto;
 
 public interface FromPointerBuilder<T> {
-    T constructBuilder(SegmentBuilder segment, int ptr,
-                       int elementCount, int step,
-                       int structDataSize, short structPointerCount);
     T fromPointerBuilder(PointerBuilder builder, SegmentReader defaultSegment, int defaultOffset);
     T initFromPointerBuilder(PointerBuilder builder, int elementCount);
 }
diff --git a/runtime/src/main/java/org/capnproto/FromPointerReader.java b/runtime/src/main/java/org/capnproto/FromPointerReader.java
index 44fca8d..27cde66 100644
--- a/runtime/src/main/java/org/capnproto/FromPointerReader.java
+++ b/runtime/src/main/java/org/capnproto/FromPointerReader.java
@@ -1,10 +1,5 @@
 package org.capnproto;
 
 public interface FromPointerReader<T> {
-    T constructReader(SegmentReader segment,
-                      int ptr,
-                      int elementCount, int step,
-                      int structDataSize, short structPointerCount,
-                      int nestingLimit);
     T fromPointerReader(PointerReader reader, SegmentReader defaultSegment, int defaultOffset);
 }
diff --git a/runtime/src/main/java/org/capnproto/ListBuilder.java b/runtime/src/main/java/org/capnproto/ListBuilder.java
index 205938a..4e429b3 100644
--- a/runtime/src/main/java/org/capnproto/ListBuilder.java
+++ b/runtime/src/main/java/org/capnproto/ListBuilder.java
@@ -1,6 +1,12 @@
 package org.capnproto;
 
 public class ListBuilder {
+    public interface Factory<T> {
+        T constructBuilder(SegmentBuilder segment, int ptr,
+                           int elementCount, int step,
+                           int structDataSize, short structPointerCount);
+    }
+
     final SegmentBuilder segment;
     final int ptr; // byte offset to front of list
     final int elementCount;
diff --git a/runtime/src/main/java/org/capnproto/ListFactory.java b/runtime/src/main/java/org/capnproto/ListFactory.java
index 70d7109..85cedea 100644
--- a/runtime/src/main/java/org/capnproto/ListFactory.java
+++ b/runtime/src/main/java/org/capnproto/ListFactory.java
@@ -1,5 +1,6 @@
 package org.capnproto;
 
-public interface ListFactory<Builder, Reader> extends FromPointerBuilder<Builder>, FromPointerReader<Reader> {
+public interface ListFactory<Builder, Reader> extends ListBuilder.Factory<Builder>, FromPointerBuilder<Builder>,
+                                              ListReader.Factory<Reader>, FromPointerReader<Reader> {
 
 }
diff --git a/runtime/src/main/java/org/capnproto/ListReader.java b/runtime/src/main/java/org/capnproto/ListReader.java
index cebb68c..1d5143d 100644
--- a/runtime/src/main/java/org/capnproto/ListReader.java
+++ b/runtime/src/main/java/org/capnproto/ListReader.java
@@ -1,6 +1,14 @@
 package org.capnproto;
 
 public class ListReader {
+    public interface Factory<T> {
+        T constructReader(SegmentReader segment,
+                          int ptr,
+                          int elementCount, int step,
+                          int structDataSize, short structPointerCount,
+                          int nestingLimit);
+    }
+
     final SegmentReader segment;
     final int ptr; // byte offset to front of list
     final int elementCount;
diff --git a/runtime/src/main/java/org/capnproto/StructReader.java b/runtime/src/main/java/org/capnproto/StructReader.java
index b5f02e3..7a1a775 100644
--- a/runtime/src/main/java/org/capnproto/StructReader.java
+++ b/runtime/src/main/java/org/capnproto/StructReader.java
@@ -2,7 +2,6 @@ package org.capnproto;
 
 
 public class StructReader {
-
     public interface Factory<T> {
         T constructReader(SegmentReader segment, int data, int pointers,
                           int dataSize, short pointerCount,
diff --git a/runtime/src/main/java/org/capnproto/WireHelpers.java b/runtime/src/main/java/org/capnproto/WireHelpers.java
index b739c75..b594a93 100644
--- a/runtime/src/main/java/org/capnproto/WireHelpers.java
+++ b/runtime/src/main/java/org/capnproto/WireHelpers.java
@@ -188,7 +188,7 @@ final class WireHelpers {
 
     }
 
-    static <T> T initListPointer(FromPointerBuilder<T> factory,
+    static <T> T initListPointer(ListBuilder.Factory<T> factory,
                                  int refOffset,
                                  SegmentBuilder segment,
                                  int elementCount,
@@ -208,7 +208,7 @@ final class WireHelpers {
                                           elementCount, step, dataSize, (short)pointerCount);
     }
 
-    static <T> T initStructListPointer(FromPointerBuilder<T> factory,
+    static <T> T initStructListPointer(ListBuilder.Factory<T> factory,
                                        int refOffset,
                                        SegmentBuilder segment,
                                        int elementCount,
@@ -238,7 +238,7 @@ final class WireHelpers {
                                           elementSize.data * Constants.BITS_PER_WORD, elementSize.pointers);
     }
 
-    static <T> T getWritableListPointer(FromPointerBuilder<T> factory,
+    static <T> T getWritableListPointer(ListBuilder.Factory<T> factory,
                                         int origRefOffset,
                                         SegmentBuilder origSegment,
                                         byte elementSize,
@@ -296,7 +296,7 @@ final class WireHelpers {
         }
     }
 
-    static <T> T getWritableStructListPointer(FromPointerBuilder<T> factory,
+    static <T> T getWritableStructListPointer(ListBuilder.Factory<T> factory,
                                               int origRefOffset,
                                               SegmentBuilder origSegment,
                                               StructSize elementSize,
@@ -514,7 +514,7 @@ final class WireHelpers {
         throw new Error("copyPointer is unimplemented");
     }
 
-    static <T> T readListPointer(FromPointerReader<T> factory,
+    static <T> T readListPointer(ListReader.Factory<T> factory,
                                  SegmentReader segment,
                                  int refOffset,
                                  SegmentReader defaultSegment,