diff --git a/dom/tests/browser/helper_largeAllocation.js b/dom/tests/browser/helper_largeAllocation.js
index 33984eb02690..7f93600d01be 100644
--- a/dom/tests/browser/helper_largeAllocation.js
+++ b/dom/tests/browser/helper_largeAllocation.js
@@ -54,7 +54,7 @@ function getInLAProc(aBrowser) {
 
 async function largeAllocSuccessTests() {
   // I'm terrible and put this set of tests into a single file, so I need a longer timeout
-  requestLongerTimeout(2);
+  requestLongerTimeout(4);
 
   // Check if we are on win32
   let isWin32 = /Windows/.test(navigator.userAgent) && !/x64/.test(navigator.userAgent);