diff --git a/Objects/intobject.c b/Objects/intobject.c
index d7a64be..86e2e8c 100644
--- a/Objects/intobject.c
+++ b/Objects/intobject.c
@@ -1069,6 +1069,7 @@
 	int_true_divide,	/* nb_true_divide */
 	0,			/* nb_inplace_floor_divide */
 	0,			/* nb_inplace_true_divide */
+	(lenfunc)PyInt_AsSsize_t, /* nb_index */
 };
 
 PyTypeObject PyInt_Type = {