#1535: rename __builtin__ module to builtins.
diff --git a/Python/errors.c b/Python/errors.c
index 1cd5dfd..063187b 100644
--- a/Python/errors.c
+++ b/Python/errors.c
@@ -645,7 +645,7 @@
 			else {
 				char* modstr = PyUnicode_AsString(moduleName);
 				if (modstr &&
-				    strcmp(modstr, "__builtin__") != 0)
+				    strcmp(modstr, "builtins") != 0)
 				{
 					PyFile_WriteString(modstr, f);
 					PyFile_WriteString(".", f);