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diff --git a/deps/v8/test/mjsunit/es6/map-iterator-9.js b/deps/v8/test/mjsunit/es6/map-iterator-9.js
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index 0000000000..2db159d80e
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+++ b/deps/v8/test/mjsunit/es6/map-iterator-9.js
@@ -0,0 +1,30 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --allow-natives-syntax --no-stress-opt
+
+// This tests the interaction between the MapIterator protector and SetIterator
+// protector.
+
+var map = new Map([[1,2], [2,3], [3,4]]);
+assertTrue(%MapIteratorProtector());
+
+var set = new Set([1,2,3]);
+assertTrue(%SetIteratorProtector());
+
+var iterator = map.keys();
+iterator[Symbol.iterator] = () => ({next: () => ({done: true})});
+
+assertFalse(%MapIteratorProtector());
+assertEquals([[1,2], [2,3], [3,4]], [...map]);
+assertEquals([[1,2], [2,3], [3,4]], [...map.entries()]);
+assertEquals([1,2,3], [...map.keys()]);
+assertEquals([2,3,4], [...map.values()]);
+assertEquals([], [...iterator]);
+
+assertFalse(%SetIteratorProtector());
+assertEquals([1,2,3], [...set]);
+assertEquals([[1,1],[2,2],[3,3]], [...set.entries()]);
+assertEquals([1,2,3], [...set.keys()]);
+assertEquals([1,2,3], [...set.values()]);