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-rw-r--r--Modules/_io/iobase.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/Modules/_io/iobase.c b/Modules/_io/iobase.c
index 472ef3b97c..ee6ad474b5 100644
--- a/Modules/_io/iobase.c
+++ b/Modules/_io/iobase.c
@@ -661,7 +661,8 @@ _io__IOBase_readlines_impl(PyObject *self, Py_ssize_t hint)
to remove the bytecode interpretation overhead, but it could
probably be removed here. */
_Py_IDENTIFIER(extend);
- PyObject *ret = _PyObject_CallMethodId(result, &PyId_extend, "O", self);
+ PyObject *ret = _PyObject_CallMethodIdObjArgs(result, &PyId_extend,
+ self, NULL);
if (ret == NULL) {
Py_DECREF(result);