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diff --git a/js/src/tests/test262/language/expressions/object/method-definition/async-gen-meth-dflt-params-ref-prior.js b/js/src/tests/test262/language/expressions/object/method-definition/async-gen-meth-dflt-params-ref-prior.js
new file mode 100644
index 0000000000..cbf1d7b093
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+++ b/js/src/tests/test262/language/expressions/object/method-definition/async-gen-meth-dflt-params-ref-prior.js
@@ -0,0 +1,53 @@
+// |reftest| async
+// This file was procedurally generated from the following sources:
+// - src/function-forms/dflt-params-ref-prior.case
+// - src/function-forms/default/async-gen-meth.template
+/*---
+description: Referencing a parameter that occurs earlier in the ParameterList (async generator method)
+esid: sec-asyncgenerator-definitions-propertydefinitionevaluation
+features: [default-parameters, async-iteration]
+flags: [generated, async]
+info: |
+    AsyncGeneratorMethod :
+        async [no LineTerminator here] * PropertyName ( UniqueFormalParameters )
+            { AsyncGeneratorBody }
+
+    1. Let propKey be the result of evaluating PropertyName.
+    2. ReturnIfAbrupt(propKey).
+    3. If the function code for this AsyncGeneratorMethod is strict mode code, let strict be true.
+       Otherwise let strict be false.
+    4. Let scope be the running execution context's LexicalEnvironment.
+    5. Let closure be ! AsyncGeneratorFunctionCreate(Method, UniqueFormalParameters,
+       AsyncGeneratorBody, scope, strict).
+    [...]
+
+
+    14.1.19 Runtime Semantics: IteratorBindingInitialization
+
+    FormalsList : FormalsList , FormalParameter
+
+    1. Let status be the result of performing IteratorBindingInitialization for
+       FormalsList using iteratorRecord and environment as the arguments.
+    2. ReturnIfAbrupt(status).
+    3. Return the result of performing IteratorBindingInitialization for
+       FormalParameter using iteratorRecord and environment as the arguments.
+
+---*/
+var x = 0;
+
+var callCount = 0;
+var obj = {
+  async *method(x, y = x, z = y) {
+    assert.sameValue(x, 3, 'first argument value');
+    assert.sameValue(y, 3, 'second argument value');
+    assert.sameValue(z, 3, 'third argument value');
+    callCount = callCount + 1;
+  }
+};
+
+// Stores a reference `ref` for case evaluation
+var ref = obj.method;
+
+ref(3).next().then(() => {
+    assert.sameValue(callCount, 1, 'generator method invoked exactly once');
+}).then($DONE, $DONE);