diff --git a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/U64.java b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/U64.java
index 3b89e24..8cd577f 100644
--- a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/U64.java
+++ b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/U64.java
@@ -22,6 +22,8 @@
 import org.jboss.netty.buffer.ChannelBuffer;
 import org.projectfloodlight.openflow.protocol.Writeable;
 
+import com.google.common.primitives.UnsignedLongs;
+
 public class U64 implements Writeable, OFValueType<U64> {
     private static final long UNSIGNED_MASK = 0x7fffffffffffffffL;
     private final static long ZERO_VAL = 0;
@@ -113,4 +115,9 @@
         bb.writeLong(raw);
     }
 
+    @Override
+    public int compareTo(U64 o) {
+        return UnsignedLongs.compare(raw, o.raw);
+    }
+
 }