1 files changed, 3 insertions, 3 deletions
diff --git a/components/script/dom/bindings/codegen/parser/tests/test_union_nullable.py b/components/script/dom/bindings/codegen/parser/tests/test_union_nullable.py
index 08430a94a2e..71da4349e6e 100644
--- a/components/script/dom/bindings/codegen/parser/tests/test_union_nullable.py
+++ b/components/script/dom/bindings/codegen/parser/tests/test_union_nullable.py
@@ -3,7 +3,7 @@ def WebIDLTest(parser, harness):
     try:
         parser.parse("""
             interface OneNullableInUnion {
-              void foo((object? or DOMString?) arg);
+              undefined foo((object? or DOMString?) arg);
             };
         """)
 
@@ -20,7 +20,7 @@ def WebIDLTest(parser, harness):
     try:
         parser.parse("""
             interface NullableInNullableUnion {
-              void foo((object? or DOMString)? arg);
+              undefined foo((object? or DOMString)? arg);
             };
         """)
 
@@ -40,7 +40,7 @@ def WebIDLTest(parser, harness):
             interface NullableInUnionNullableUnionHelper {
             };
             interface NullableInUnionNullableUnion {
-              void foo(((object? or DOMString) or NullableInUnionNullableUnionHelper)? arg);
+              undefined foo(((object? or DOMString) or NullableInUnionNullableUnionHelper)? arg);
             };
         """)