Index: Objects/setobject.c
===================================================================
--- Objects/setobject.c	(revision 86728)
+++ Objects/setobject.c	(working copy)
@@ -1858,7 +1858,7 @@
         tmpkey = make_new_set(&PyFrozenSet_Type, key);
         if (tmpkey == NULL)
             return -1;
-        rv = set_contains(so, tmpkey);
+        rv = set_contains_key(so, tmpkey);
         Py_DECREF(tmpkey);
     }
     return rv;