diff -r 967af1815967 Modules/fcntlmodule.c
--- a/Modules/fcntlmodule.c	Mon Sep 09 18:48:24 2013 -0500
+++ b/Modules/fcntlmodule.c	Tue Sep 10 14:59:29 2013 +0800
@@ -626,6 +626,8 @@
         return NULL;
 
     /* Add some symbolic constants to the module */
-    all_ins(m);
+    if (all_ins(m))
+        return NULL;
+
     return m;
 }