diff --git a/dom/ipc/tests/browser_JSWindowActor.js b/dom/ipc/tests/browser_JSWindowActor.js
index dc8b5dd73e38..8f97e282ff3d 100644
--- a/dom/ipc/tests/browser_JSWindowActor.js
+++ b/dom/ipc/tests/browser_JSWindowActor.js
@@ -5,7 +5,7 @@
 // This test opens and closes a large number of windows, which can be slow
 // especially on debug builds. This decreases the likelihood of the test timing
 // out.
-requestLongerTimeout(2);
+requestLongerTimeout(4);
 
 const URL = "about:blank";
 const TEST_URL = "http://test2.example.org/";