Insert missing flag.

diff --git a/Objects/classobject.c b/Objects/classobject.c
index 68505f1527bc517d3f7ab920bfb5cf623f3ea370..ce2c073db9601c64ff84cae17f88fb9c180c00b8 100644 (file)
--- a/Objects/classobject.c
+++ b/Objects/classobject.c
@@ -2486,7 +2486,7 @@ PyTypeObject PyMethod_Type = {
        (getattrofunc)instancemethod_getattro,  /* tp_getattro */
        PyObject_GenericSetAttr,                /* tp_setattro */
        0,                                      /* tp_as_buffer */
-       Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
+       Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC  | Py_TPFLAGS_HAVE_WEAKREFS, /* tp_flags */
        instancemethod_doc,                     /* tp_doc */
        (traverseproc)instancemethod_traverse,  /* tp_traverse */
        0,                                      /* tp_clear */