diff --git a/Objects/funcobject.c b/Objects/funcobject.c
index e5278f0..8648821 100644
--- a/Objects/funcobject.c
+++ b/Objects/funcobject.c
@@ -581,7 +581,7 @@
     PyObject **stack;
     Py_ssize_t nargs;
 
-    stack = &PyTuple_GET_ITEM(args, 0);
+    stack = _PyTuple_ITEMS(args);
     nargs = PyTuple_GET_SIZE(args);
     return _PyFunction_FastCallDict(func, stack, nargs, kwargs);
 }