diff --git a/src/codegen.inc.php b/src/codegen.inc.php
index 66fab35..b3b424b 100644
--- a/src/codegen.inc.php
+++ b/src/codegen.inc.php
@@ -40,6 +40,7 @@ function supported_tokens() : array
   return [
     'POD',
     'default',
+    'alias',
     'virtual',
     'bitfields',
     'cloneable',