diff --git a/browser/components/search/test/browser_private_search_perwindowpb.js b/browser/components/search/test/browser_private_search_perwindowpb.js
index f7656c73abd9..2dc911bd3ace 100644
--- a/browser/components/search/test/browser_private_search_perwindowpb.js
+++ b/browser/components/search/test/browser_private_search_perwindowpb.js
@@ -3,6 +3,10 @@
 // whether there is an autocomplete entry for the private search.
 
 function test() {
+  // Don't use about:home as the homepage for new windows
+  Services.prefs.setIntPref("browser.startup.page", 0);
+  registerCleanupFunction(function() Services.prefs.clearUserPref("browser.startup.page"));
+
   waitForExplicitFinish();
 
   let engineURL =