diff --git a/workers/modules/shared-worker-parse-error-failure.html b/workers/modules/shared-worker-parse-error-failure.html
index d3d86b3f8fca9c5..72cea13946536e1 100644
--- a/workers/modules/shared-worker-parse-error-failure.html
+++ b/workers/modules/shared-worker-parse-error-failure.html
@@ -31,7 +31,8 @@
   assert_equals(args.a.constructor, Event);
   assert_true('message' in args.a, 'Event.message');
   assert_equals(typeof args.a.message, 'string', 'Event.message');
-  assert_equals(args.a.filename, location.href + '/resources/syntax-error.js');
+  assert_equals(args.a.filename, location.href + '/resources/syntax-error.js'),
+                'Event.filename');
   assert_equals(args.a.lineno, 1, 'Event.lineno');
   assert_equals(args.b, undefined, 'unexpected second argument to onerror');
   assert_equals(args.c, undefined, 'unexpected third argument to onerror');
diff --git a/workers/shared-worker-parse-error-failure.html b/workers/shared-worker-parse-error-failure.html
index 5f98e59d8fe8aea..4389904cb46a5e0 100644
--- a/workers/shared-worker-parse-error-failure.html
+++ b/workers/shared-worker-parse-error-failure.html
@@ -8,7 +8,8 @@
   assert_equals(args.a.constructor, Event);
   assert_true('message' in args.a, 'Event.message');
   assert_equals(typeof args.a.message, 'string', 'Event.message');
-  assert_equals(args.a.filename, location.href + '/resources/syntax-error.js');
+  assert_equals(args.a.filename, location.href + '/resources/syntax-error.js',
+                'Event.filename');
   assert_equals(args.a.lineno, 1, 'Event.lineno');
   assert_equals(args.b, undefined, 'unexpected second argument to onerror');
   assert_equals(args.c, undefined, 'unexpected third argument to onerror');