1 files changed, 1 insertions, 1 deletions
diff --git a/dom/base/test/useractivation/test_useractivation_scrollbar.html b/dom/base/test/useractivation/test_useractivation_scrollbar.html
index 778d6d0898..197cdc49fb 100644
--- a/dom/base/test/useractivation/test_useractivation_scrollbar.html
+++ b/dom/base/test/useractivation/test_useractivation_scrollbar.html
@@ -78,7 +78,7 @@ if (!opener) {
   SimpleTest.waitForFocus(async function() {
     function waitForEvent(aTarget, aEvent) {
       return new Promise((aResolve) => {
-        aTarget.addEventListener(aEvent, function listener(event) {
+        aTarget.addEventListener(aEvent, function listener() {
           aResolve();
         }, { once: true });
       });