diff --git a/dom/media/test/test_eme_pssh_in_moof.html b/dom/media/test/test_eme_pssh_in_moof.html
--- a/dom/media/test/test_eme_pssh_in_moof.html
+++ b/dom/media/test/test_eme_pssh_in_moof.html
@@ -115,11 +115,11 @@
         });
 
         session.generateRequest(event.initDataType, event.initData);
       }
 
-      video.addEventListener("encrypted", handleEncrypted, false);
+      video.addEventListener("encrypted", handleEncrypted);
 
       video.addEventListener("ended", () => {
         let expectedEncryptedEvents =
           test.tracks.reduce((sum, track) => sum += track.initDatas, 0);
         is(encryptedEventCount, expectedEncryptedEvents,