diff --git a/Lib/python/pythonkw.swg b/Lib/python/pythonkw.swg
index 33b145421..28222efd1 100644
--- a/Lib/python/pythonkw.swg
+++ b/Lib/python/pythonkw.swg
@@ -36,7 +36,7 @@ PYTHONKW(yield);
 
 #undef PYTHONKW
 
-#define PYTHONBN(x) %namewarn("315:" #x " conflicts with a built-in name in python")  "::"#x
+#define PYTHONBN(x) %namewarn("321:" #x " conflicts with a built-in name in python")  "::"#x
 
 /* recurrent built-in functions */
 PYTHONBN(close);