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diff --git a/js/src/tests/test262/language/statements/async-generator/generator-created-after-decl-inst.js b/js/src/tests/test262/language/statements/async-generator/generator-created-after-decl-inst.js
new file mode 100644
index 0000000000..403a0b70fc
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+++ b/js/src/tests/test262/language/statements/async-generator/generator-created-after-decl-inst.js
@@ -0,0 +1,26 @@
+// Copyright (C) 2018 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-asyncgenerator-definitions-evaluatebody
+description: >
+    The generator object is created after FunctionDeclarationInstantiation.
+info: |
+    14.5.10 Runtime Semantics: EvaluateBody
+
+    1. Perform ? FunctionDeclarationInstantiation(functionObject, argumentsList).
+    2. Let generator be ? OrdinaryCreateFromConstructor(functionObject, "%AsyncGeneratorPrototype%",
+       « [[AsyncGeneratorState]], [[AsyncGeneratorContext]], [[AsyncGeneratorQueue]] »).
+    3. Perform ! AsyncGeneratorStart(generator, FunctionBody).
+    ...
+
+features: [async-iteration]
+---*/
+
+async function* g(a = (g.prototype = null)) {}
+var oldPrototype = g.prototype;
+var it = g();
+
+assert.notSameValue(Object.getPrototypeOf(it), oldPrototype);
+
+reportCompare(0, 0);