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diff --git a/js/src/tests/test262/built-ins/AsyncGeneratorPrototype/return/return-state-completed.js b/js/src/tests/test262/built-ins/AsyncGeneratorPrototype/return/return-state-completed.js
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index 0000000000..c4cb8b6559
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+++ b/js/src/tests/test262/built-ins/AsyncGeneratorPrototype/return/return-state-completed.js
@@ -0,0 +1,39 @@
+// |reftest| async
+// Copyright 2018 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-asyncgenerator-prototype-return
+description: return() results in fullfilled promise when called on completed iterator
+info: |
+  AsyncGenerator.prototype.return ( value )
+  1. Let generator be the this value.
+  2. Let completion be Completion{[[Type]]: return, [[Value]]: value, [[Target]]: empty}.
+  3. Return ! AsyncGeneratorEnqueue(generator, completion).
+
+  AsyncGeneratorEnqueue ( generator, completion )
+  ...
+  8. If state is not "executing", then
+    a. Perform ! AsyncGeneratorResumeNext(generator).
+  ...
+
+  AsyncGeneratorResumeNext:
+  If completion.[[Type]] is throw, and generator.[[AsyncGeneratorState]] is
+  "completed"
+flags: [async]
+features: [async-iteration]
+---*/
+
+var g = async function*() {};
+
+var iter = g();
+iter.next().then(function(result) {
+  assert.sameValue(result.value, undefined);
+  assert.sameValue(result.done, true);
+
+  iter.return(42).then(function(result) {
+    assert.sameValue(result.value, 42)
+    assert.sameValue(result.done, true)
+  }).then($DONE, $DONE);
+
+}).catch($DONE);