diff --git a/mozilla/js/src/jsobj.c b/mozilla/js/src/jsobj.c
index b09597099d5..65834008f6f 100644
--- a/mozilla/js/src/jsobj.c
+++ b/mozilla/js/src/jsobj.c
@@ -2319,10 +2319,6 @@ js_SetProperty(JSContext *cx, JSObject *obj, jsid id, jsval *vp)
      */
     CHECK_FOR_FUNNY_INDEX(id);
 
-    /* XXX - TEMPORARY HACK */
-    if (!js_LookupProperty(cx, obj, id, &tmp, (JSProperty **)&sprop))
-        return JS_FALSE;
-
     rt = cx->runtime;
     JS_LOCK_OBJ(cx, obj);
     clasp = LOCKED_OBJ_GET_CLASS(obj);