diff --git a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/IpEcn.java b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/IpEcn.java
index 7e1cdf0..654df01 100644
--- a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/IpEcn.java
+++ b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/IpEcn.java
@@ -3,6 +3,8 @@
 import org.jboss.netty.buffer.ChannelBuffer;
 import org.projectfloodlight.openflow.exceptions.OFParseError;
 
+import com.google.common.hash.PrimitiveSink;
+
 public enum IpEcn implements OFValueType<IpEcn> {
     ECN_00((byte)0),
     ECN_01((byte)1),
@@ -63,4 +65,9 @@
     public byte getEcnValue() {
         return ecn;
     }
+
+    @Override
+    public void putTo(PrimitiveSink sink) {
+        sink.putByte(ecn);
+    }
 }