1 files changed, 1 insertions, 1 deletions
diff --git a/components/script/dom/bindings/codegen/parser/tests/test_promise.py b/components/script/dom/bindings/codegen/parser/tests/test_promise.py
index 43c74029dc5..ef44a216d10 100644
--- a/components/script/dom/bindings/codegen/parser/tests/test_promise.py
+++ b/components/script/dom/bindings/codegen/parser/tests/test_promise.py
@@ -64,7 +64,7 @@ def WebIDLTest(parser, harness):
     try:
         parser.parse("""
             interface A {
-              void foo(Promise<any>? arg);
+              undefined foo(Promise<any>? arg);
             };
         """)
         results = parser.finish();