diff -r 43f27e69bc29 Modules/_tkinter.c
--- a/Modules/_tkinter.c	Sun Sep 01 19:03:41 2013 -0400
+++ b/Modules/_tkinter.c	Mon Sep 02 17:56:40 2013 -0700
@@ -2688,7 +2688,7 @@
     if (!PyArg_ParseTuple(args, ":interpaddr"))
         return NULL;
 
-    return PyLong_FromLong((long)Tkapp_Interp(self));
+    return PyLong_FromSsize_t((Py_ssize_t)Tkapp_Interp(self));
 }
 
 static PyObject *