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-rw-r--r--Modules/_functoolsmodule.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/Modules/_functoolsmodule.c b/Modules/_functoolsmodule.c
index 8701f6c89d..0fb4847af9 100644
--- a/Modules/_functoolsmodule.c
+++ b/Modules/_functoolsmodule.c
@@ -1236,7 +1236,7 @@ PyDoc_STRVAR(module_doc,
static PyMethodDef module_methods[] = {
{"reduce", functools_reduce, METH_VARARGS, functools_reduce_doc},
- {"cmp_to_key", (PyCFunction)functools_cmp_to_key,
+ {"cmp_to_key", (PyCFunction)(void(*)(void))functools_cmp_to_key,
METH_VARARGS | METH_KEYWORDS, functools_cmp_to_key_doc},
{NULL, NULL} /* sentinel */
};