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diff --git a/test/built-ins/AsyncGeneratorFunction/extensibility.js b/test/built-ins/AsyncGeneratorFunction/extensibility.js
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+// Copyright (C) 2018 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-properties-of-asyncgeneratorfunction
+description: Object extensibility
+info: |
+  The value of the [[Extensible]] internal slot of the AsyncGeneratorFunction
+  constructor is true.
+features: [async-iteration]
+---*/
+
+var AsyncGeneratorFunction = Object.getPrototypeOf(async function* () {}).constructor;
+
+assert(Object.isExtensible(AsyncGeneratorFunction));