diff --git a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/IPv6AddressWithMask.java b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/IPv6AddressWithMask.java
index f918d1c..727daf6 100644
--- a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/IPv6AddressWithMask.java
+++ b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/IPv6AddressWithMask.java
@@ -3,8 +3,6 @@
 import java.math.BigInteger;
 import java.util.Arrays;
 
-import org.projectfloodlight.openflow.types.IPAddress.IpVersion;
-
 public class IPv6AddressWithMask extends IPAddressWithMask<IPv6Address> {
     public final static IPv6AddressWithMask NONE = of(IPv6Address.NONE, IPv6Address.NONE);
 
@@ -13,8 +11,8 @@
     }
 
     @Override
-    public IpVersion getIpVersion() {
-        return IpVersion.IPv6;
+    public IPVersion getIpVersion() {
+        return IPVersion.IPv6;
     }
 
     public static IPv6AddressWithMask of(IPv6Address value, IPv6Address mask) {