diff --git a/Objects/typeobject.c b/Objects/typeobject.c
index 8d2bf8c..0905d19 100644
--- a/Objects/typeobject.c
+++ b/Objects/typeobject.c
@@ -4186,10 +4186,10 @@
 
 	if (value == NULL)
 		res = call_method(self, "__delitem__", &delitem_str,
-				  "(i)", index);
+				  "(n)", index);
 	else
 		res = call_method(self, "__setitem__", &setitem_str,
-				  "(iO)", index, value);
+				  "(nO)", index, value);
 	if (res == NULL)
 		return -1;
 	Py_DECREF(res);
@@ -4204,10 +4204,10 @@
 
 	if (value == NULL)
 		res = call_method(self, "__delslice__", &delslice_str,
-				  "(ii)", i, j);
+				  "(nn)", i, j);
 	else
 		res = call_method(self, "__setslice__", &setslice_str,
-				  "(iiO)", i, j, value);
+				  "(nnO)", i, j, value);
 	if (res == NULL)
 		return -1;
 	Py_DECREF(res);