--- a/js/src/shell/js.cpp
+++ b/js/src/shell/js.cpp
@@ -2768,16 +2768,18 @@ split_thisObject(JSContext *cx, JSObject
 static JSObjectOps split_objectops;
 
 static JSObjectOps *
 split_getObjectOps(JSContext *cx, JSClass *clasp)
 {
     if (!split_objectops.thisObject) {
         memcpy(&split_objectops, &js_ObjectOps, sizeof split_objectops);
         split_objectops.thisObject = split_thisObject;
+        split_objectops.call = NULL;
+        split_objectops.construct = NULL;
     }
 
     return &split_objectops;
 }
 
 static JSBool
 split_equality(JSContext *cx, JSObject *obj, jsval v, JSBool *bp);