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-rw-r--r--Modules/_weakref.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/Modules/_weakref.c b/Modules/_weakref.c
index 157a852..387b8fa 100644
--- a/Modules/_weakref.c
+++ b/Modules/_weakref.c
@@ -174,6 +174,7 @@ weakref_exec(PyObject *module)
static struct PyModuleDef_Slot weakref_slots[] = {
{Py_mod_exec, weakref_exec},
+ {Py_mod_multiple_interpreters, Py_MOD_PER_INTERPRETER_GIL_SUPPORTED},
{0, NULL}
};