diff --git a/testing/web-platform/mozilla/tests/fetch/fetchpriority/fetchpriority.h2.html b/testing/web-platform/mozilla/tests/fetch/fetchpriority/fetchpriority.h2.html
index 4065544fe2ca..9f81a04b0103 100644
--- a/testing/web-platform/mozilla/tests/fetch/fetchpriority/fetchpriority.h2.html
+++ b/testing/web-platform/mozilla/tests/fetch/fetchpriority/fetchpriority.h2.html
@@ -2,6 +2,7 @@
 <html>
 <head>
   <meta charset="UTF-8">
+  <meta name="timeout" content="long">
   <title>fetchpriority: internal priorities of corresponding http-on-opening-requests</title>
   <script src="/resources/testharness.js"></script>
   <script src="/resources/testharnessreport.js"></script>
