diff --git a/restful-api-common/src/main/java/meerkat/rest/ProtobufMessageBodyReader.java b/restful-api-common/src/main/java/meerkat/rest/ProtobufMessageBodyReader.java
index d09e213..ebf80a0 100644
--- a/restful-api-common/src/main/java/meerkat/rest/ProtobufMessageBodyReader.java
+++ b/restful-api-common/src/main/java/meerkat/rest/ProtobufMessageBodyReader.java
@@ -32,7 +32,7 @@ public class ProtobufMessageBodyReader implements MessageBodyReader<Message> {
                             InputStream entityStream) throws IOException, WebApplicationException {
         try {
             Method newBuilder = type.getMethod("newBuilder");
-            GeneratedMessage.Builder<?> builder = (GeneratedMessage.Builder<?>) newBuilder.invoke(type);
+            Message.Builder builder = (Message.Builder) newBuilder.invoke(type);
             return builder.mergeFrom(entityStream).build();
         } catch (Exception e) {
             throw new WebApplicationException(e);