diff --git a/runtime/pom.xml b/runtime/pom.xml
index 1f34c56..900ce60 100644
--- a/runtime/pom.xml
+++ b/runtime/pom.xml
@@ -37,4 +37,17 @@
             <scope>test</scope>
         </dependency>
     </dependencies>
+
+    <build>
+      <plugins>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-compiler-plugin</artifactId>
+          <version>3.3</version>
+          <configuration>
+            <compilerArgument>-Xlint:unchecked</compilerArgument>
+          </configuration>
+        </plugin>
+      </plugins>
+    </build>
 </project>
diff --git a/runtime/src/main/java/org/capnproto/EnumList.java b/runtime/src/main/java/org/capnproto/EnumList.java
index 89f64e5..c74bd45 100644
--- a/runtime/src/main/java/org/capnproto/EnumList.java
+++ b/runtime/src/main/java/org/capnproto/EnumList.java
@@ -93,10 +93,10 @@ public class EnumList {
         }
 
         public final Reader<T> asReader() {
-            return new Reader(this.values,
-                              this.segment, this.ptr, this.elementCount, this.step,
-                              this.structDataSize, this.structPointerCount,
-                              java.lang.Integer.MAX_VALUE);
+            return new Reader<T>(this.values,
+                                 this.segment, this.ptr, this.elementCount, this.step,
+                                 this.structDataSize, this.structPointerCount,
+                                 java.lang.Integer.MAX_VALUE);
         }
     }
 }
diff --git a/runtime/src/main/java/org/capnproto/ListList.java b/runtime/src/main/java/org/capnproto/ListList.java
index 3981cbe..13488aa 100644
--- a/runtime/src/main/java/org/capnproto/ListList.java
+++ b/runtime/src/main/java/org/capnproto/ListList.java
@@ -89,10 +89,10 @@ public final class ListList {
 
         // TODO: rework generics so that we don't need this factory parameter
         public final <U extends ListReader> Reader<U> asReader(ListFactory<T, U> factor) {
-            return new Reader(factor,
-                              this.segment, this.ptr, this.elementCount, this.step,
-                              this.structDataSize, this.structPointerCount,
-                              java.lang.Integer.MAX_VALUE);
+            return new Reader<U>(factor,
+                                 this.segment, this.ptr, this.elementCount, this.step,
+                                 this.structDataSize, this.structPointerCount,
+                                 java.lang.Integer.MAX_VALUE);
         }
     }
 }
diff --git a/runtime/src/main/java/org/capnproto/StructList.java b/runtime/src/main/java/org/capnproto/StructList.java
index b14e7f8..9ed670d 100644
--- a/runtime/src/main/java/org/capnproto/StructList.java
+++ b/runtime/src/main/java/org/capnproto/StructList.java
@@ -149,10 +149,10 @@ public final class StructList {
          * TODO: rework generics, so that we don't need this factory parameter
          */
         public final <U extends StructReader> Reader<U> asReader(StructFactory<T, U> factory) {
-            return new Reader(factory,
-                              this.segment, this.ptr, this.elementCount, this.step,
-                              this.structDataSize, this.structPointerCount,
-                              java.lang.Integer.MAX_VALUE);
+            return new Reader<U>(factory,
+                                 this.segment, this.ptr, this.elementCount, this.step,
+                                 this.structDataSize, this.structPointerCount,
+                                 java.lang.Integer.MAX_VALUE);
         }
 
         public final class Iterator implements java.util.Iterator<T> {