diff --git a/docshell/test/browser/browser_bug503832.js b/docshell/test/browser/browser_bug503832.js
index a3f320fc6f02..a0715a0c7a88 100644
--- a/docshell/test/browser/browser_bug503832.js
+++ b/docshell/test/browser/browser_bug503832.js
@@ -6,8 +6,8 @@ function test() {
     waitForExplicitFinish();
 
     var pagetitle = "Page Title for Bug 503832";
-    var pageurl = "http://localhost:8888/browser/docshell/test/browser/file_bug503832.html";
-    var fragmenturl = "http://localhost:8888/browser/docshell/test/browser/file_bug503832.html#firefox";
+    var pageurl = "http://mochi.test:8888/browser/docshell/test/browser/file_bug503832.html";
+    var fragmenturl = "http://mochi.test:8888/browser/docshell/test/browser/file_bug503832.html#firefox";
 
     /* Global history observer that triggers for the two test URLs above. */
     var historyObserver = {