diff --git a/src/codegen.inc.php b/src/codegen.inc.php
index 77a5cd2..6ef4330 100644
--- a/src/codegen.inc.php
+++ b/src/codegen.inc.php
@@ -25,6 +25,7 @@ function supported_tokens()
     'POD',
     'default',
     'optional',
+    'bitfields',
     'cloneable',
     'virtual',
     'id',