diff --git a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/TransportPort.java b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/TransportPort.java
index 01019b0..6ab0254 100644
--- a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/TransportPort.java
+++ b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/TransportPort.java
@@ -32,6 +32,8 @@
     public static TransportPort of(int port) {
         if(port == NONE_VAL)
             return NONE;
+        else if (port == NO_MASK.port)
+            return NO_MASK;
         else if (port < MIN_PORT || port > MAX_PORT) {
             throw new IllegalArgumentException("Illegal transport layer port number: " + port);
         }