diff --git a/Objects/odictobject.c b/Objects/odictobject.c
index 104d6c1..7df419e 100644
--- a/Objects/odictobject.c
+++ b/Objects/odictobject.c
@@ -998,7 +998,7 @@
         goto Done;
     else {
         PyObject *empty, *od_vars, *iterator, *key;
-        int ns_len;
+        Py_ssize_t ns_len;
 
         /* od.__dict__ isn't necessarily a dict... */
         ns = PyObject_CallMethod((PyObject *)vars, "copy", NULL);