diff --git a/Objects/tupleobject.c b/Objects/tupleobject.c
index 0a959092753..d808e08aa14 100644
--- a/Objects/tupleobject.c
+++ b/Objects/tupleobject.c
@@ -930,7 +930,7 @@ PyTuple_Fini(void)
 
 typedef struct {
     PyObject_HEAD
-    long it_index;
+    Py_ssize_t it_index;
     PyTupleObject *it_seq; /* Set to NULL when iterator is exhausted */
 } tupleiterobject;