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diff --git a/test/built-ins/Object/prototype/toString/proxy-array.js b/test/built-ins/Object/prototype/toString/proxy-array.js
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+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-object.prototype.tostring
+es6id: 19.1.3.6
+description: Proxy of an array is treated as an array
+info: |
+  [...]
+  3. Let O be ToObject(this value).
+  4. Let isArray be ? IsArray(O).
+  5. If isArray is true, let builtinTag be "Array".
+  [...]
+
+  7.2.2 IsArray
+
+  [...]
+  3. If argument is a Proxy exotic object, then
+     a. If the value of the [[ProxyHandler]] internal slot of argument is null,
+        throw a TypeError exception.
+     b. Let target be the value of the [[ProxyTarget]] internal slot of
+        argument.
+     c. Return ? IsArray(target).
+features: [Proxy]
+---*/
+
+var objectProxy = new Proxy({}, {});
+var arrayProxy = new Proxy([], {});
+var arrayProxyProxy = new Proxy(arrayProxy, {});
+
+assert.sameValue(
+  Object.prototype.toString.call(objectProxy), '[object Object]'
+);
+assert.sameValue(
+  Object.prototype.toString.call(arrayProxy), '[object Array]', 'array proxy'
+);
+assert.sameValue(
+  Object.prototype.toString.call(arrayProxyProxy),
+  '[object Array]',
+  'proxy for array proxy'
+);