diff --git a/Objects/setobject.c b/Objects/setobject.c
index 39465f3..fbbdf6e 100644
--- a/Objects/setobject.c
+++ b/Objects/setobject.c
@@ -2109,7 +2109,7 @@
 	&set_as_number,			/* tp_as_number */
 	&set_as_sequence,		/* tp_as_sequence */
 	0,				/* tp_as_mapping */
-	0,				/* tp_hash */
+	(hashfunc)PyObject_HashNotImplemented,	/* tp_hash */
 	0,				/* tp_call */
 	0,				/* tp_str */
 	PyObject_GenericGetAttr,	/* tp_getattro */