diff --git a/test/mjsunit/harmony/array-species-constructor.js b/test/mjsunit/harmony/array-species-constructor.js
index d4eeefa..d766e09 100644
--- a/test/mjsunit/harmony/array-species-constructor.js
+++ b/test/mjsunit/harmony/array-species-constructor.js
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --harmony-species
+// Flags: --harmony-species --allow-natives-syntax
 
 // Overwriting the constructor of an instance updates the protector
 
@@ -18,6 +18,7 @@
 class MyArray extends Array { }
 
 x.constructor = MyArray;
+assertFalse(%SpeciesProtector());
 
 assertEquals(MyArray, x.map(()=>{}).constructor);
 assertEquals(MyArray, x.filter(()=>{}).constructor);