diff --git a/tools/ac_converter.py b/tools/ac_converter.py
index e88f2e2bb..c7c9f449d 100755
--- a/tools/ac_converter.py
+++ b/tools/ac_converter.py
@@ -296,7 +296,7 @@ endforeach
 
 # Convert sizeof checks.
 
-for elem, typename in size:
+for elem, typename in sizes:
     print("cdata.set('%s', cc.sizeof('%s'))" % (elem, typename))
 
 print('''