diff --git a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/OFMetadata.java b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/OFMetadata.java
index 0844d89..d1a23df 100644
--- a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/OFMetadata.java
+++ b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/OFMetadata.java
@@ -2,6 +2,8 @@
 
 import org.jboss.netty.buffer.ChannelBuffer;
 
+import com.google.common.hash.PrimitiveSink;
+
 public class OFMetadata implements OFValueType<OFMetadata> {
 
     static int LENGTH = 8;
@@ -67,4 +69,9 @@
     public int compareTo(OFMetadata o) {
         return u64.compareTo(o.u64);
     }
+
+    @Override
+    public void putTo(PrimitiveSink sink) {
+        u64.putTo(sink);
+    }
 }