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-rw-r--r--Objects/longobject.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/Objects/longobject.c b/Objects/longobject.c
index 834e2c2026..22d4741bcd 100644
--- a/Objects/longobject.c
+++ b/Objects/longobject.c
@@ -3643,7 +3643,8 @@ PyTypeObject PyLong_Type = {
PyObject_GenericGetAttr, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
- Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */
+ Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE |
+ Py_TPFLAGS_LONG_SUBCLASS, /* tp_flags */
long_doc, /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */