diff --git a/Objects/listobject.c b/Objects/listobject.c
index 6370ba4fbc9f89..e7c1d952579eba 100644
--- a/Objects/listobject.c
+++ b/Objects/listobject.c
@@ -3929,7 +3929,7 @@ listiter_dealloc(PyObject *self)
     _PyListIterObject *it = (_PyListIterObject *)self;
     _PyObject_GC_UNTRACK(it);
     Py_XDECREF(it->it_seq);
-    assert(Py_TYPE(self)==_PyListIterObject);
+    assert(Py_IS_TYPE(self, &PyListIter_Type));
     _Py_FREELIST_FREE(list_iters, it, PyObject_GC_Del);
 }
 
diff --git a/Objects/tupleobject.c b/Objects/tupleobject.c
index 67a8a49b03c97b..f1eb3015625f90 100644
--- a/Objects/tupleobject.c
+++ b/Objects/tupleobject.c
@@ -996,6 +996,7 @@ tupleiter_dealloc(PyObject *self)
     _PyTupleIterObject *it = _PyTupleIterObject_CAST(self);
     _PyObject_GC_UNTRACK(it);
     Py_XDECREF(it->it_seq);
+    assert(Py_IS_TYPE(self, &PyTupleIter_Type));
     _Py_FREELIST_FREE(tuple_iters, it, PyObject_GC_Del);
 }