Index: Modules/config.c.in
===================================================================
--- Modules/config.c.in	(revision 66507)
+++ Modules/config.c.in	(working copy)
@@ -45,8 +45,8 @@
 
 	/* These entries are here for sys.builtin_module_names */
 	{"__main__", NULL},
-	{"builtins", NULL},
-	{"sys", NULL},
+	{"builtins", _PyBuiltin_Init},
+	{"sys", _PySys_Init},
 
 	/* This lives in gcmodule.c */
 	{"gc", PyInit_gc},