diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c
index c6bb16c..ca40cb0 100644
--- a/Python/bltinmodule.c
+++ b/Python/bltinmodule.c
@@ -511,7 +511,7 @@
 
     if (PyUnicode_Check(cmd)) {
         cf->cf_flags |= PyCF_IGNORE_COOKIE;
-        cmd = _PyUnicode_AsDefaultEncodedString(cmd, NULL);
+        cmd = _PyUnicode_AsDefaultEncodedString(cmd);
         if (cmd == NULL)
             return NULL;
     }