1 files changed, 1 insertions, 1 deletions
diff --git a/testing/web-platform/tests/workers/Worker_cross_origin_security_err.htm b/testing/web-platform/tests/workers/Worker_cross_origin_security_err.htm
index 647a8b81e..d57dc29d5 100644
--- a/testing/web-platform/tests/workers/Worker_cross_origin_security_err.htm
+++ b/testing/web-platform/tests/workers/Worker_cross_origin_security_err.htm
@@ -8,7 +8,7 @@ async_test(function(t) {
   try {
     var w = new Worker("ftp://example.org/support/WorkerBasic.js");
     w.onerror = t.step_func_done(function(e) {
-      assert_true(e instanceof ErrorEvent);
+      assert_true(e instanceof Event);
     });
   } catch (e) {
     t.step_func_done(function(e) { assert_true(true); });