diff --git a/browser/components/preferences/in-content/tests/browser_cookies_exceptions.js b/browser/components/preferences/in-content/tests/browser_cookies_exceptions.js
index 9fe661d33d5b..f957014f4a91 100644
--- a/browser/components/preferences/in-content/tests/browser_cookies_exceptions.js
+++ b/browser/components/preferences/in-content/tests/browser_cookies_exceptions.js
@@ -3,7 +3,7 @@
 
 function test() {
   waitForExplicitFinish();
-  requestLongerTimeout(2);
+  requestLongerTimeout(3);
   testRunner.runTests();
 }