diff --git a/Include/dictobject.h b/Include/dictobject.h
index 6e08bdd747a..853fd7f6e26 100644
--- a/Include/dictobject.h
+++ b/Include/dictobject.h
@@ -42,3 +42,5 @@ extern int dictremove PROTO((object *dp, char *key));
 extern int getdictsize PROTO((object *dp));
 extern char *getdictkey PROTO((object *dp, int i));
 extern object *getdictkeys PROTO((object *dp));
+
+extern int dict2insert PROTO((object *dp, object *key, object *item));