1 files changed, 1 insertions, 1 deletions
diff --git a/tests/wpt/web-platform-tests/service-workers/service-worker/onactivate-script-error.https.html b/tests/wpt/web-platform-tests/service-workers/service-worker/onactivate-script-error.https.html
index 6c16357f3cc..f5e80bb9a45 100644
--- a/tests/wpt/web-platform-tests/service-workers/service-worker/onactivate-script-error.https.html
+++ b/tests/wpt/web-platform-tests/service-workers/service-worker/onactivate-script-error.https.html
@@ -35,7 +35,7 @@ function make_test(name, script) {
             registration = r;
 
             t.add_cleanup(function() {
-                r.unregister();
+                return r.unregister();
               });
 
             return wait_for_install(registration.installing);