#1535: rename __builtin__ module to builtins.
diff --git a/PC/os2vacpp/config.c b/PC/os2vacpp/config.c
index 62bb8b2..7be2b0b 100644
--- a/PC/os2vacpp/config.c
+++ b/PC/os2vacpp/config.c
@@ -94,7 +94,7 @@
 
         /* These entries are here for sys.builtin_module_names */
         {"__main__", NULL},
-        {"__builtin__", NULL},
+        {"builtins", NULL},
         {"sys", NULL},
 
         /* Sentinel */