diff --git a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/IPAddress.java b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/IPAddress.java
index 761c433..7c50aed 100644
--- a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/IPAddress.java
+++ b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/IPAddress.java
@@ -2,12 +2,7 @@
 
 public abstract class IPAddress<F extends IPAddress<F>> implements OFValueType<F> {
 
-    public enum IpVersion {
-        IPv4,
-        IPv6
-    }
-
-    public abstract IpVersion getIpVersion();
+    public abstract IPVersion getIpVersion();
 
     public static IPAddress<?> of(String ip) {
         if (ip.indexOf('.') != -1)