diff --git a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/ClassId.java b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/ClassId.java
index 7d7c38e..98c1253 100644
--- a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/ClassId.java
+++ b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/ClassId.java
@@ -43,7 +43,7 @@
 
     @Override
     public String toString() {
-        return Integer.toString(rawValue);
+        return UnsignedInts.toString(rawValue);
     }
 
     @Override