1 files changed, 1 insertions, 1 deletions
diff --git a/Python/ceval.c b/Python/ceval.c
index c36a38e211..deba99ed7a 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -4436,7 +4436,7 @@ unpack_iterable(PyThreadState *tstate, PyObject *v,
         *--sp = PyList_GET_ITEM(l, ll - j);
     }
     /* Resize the list. */
-    Py_SIZE(l) = ll - argcntafter;
+    Py_SET_SIZE(l, ll - argcntafter);
     Py_DECREF(it);
     return 1;