--- a/toolkit/mozapps/update/tests/chrome/utils.js
+++ b/toolkit/mozapps/update/tests/chrome/utils.js
@@ -145,19 +145,16 @@ const REL_PATH_DATA = "chrome/toolkit/mo
 
 const URL_HTTP_UPDATE_XML = URL_HOST + URL_PATH_UPDATE_XML;
 const URL_HTTPS_UPDATE_XML = "https://example.com" + URL_PATH_UPDATE_XML;
 
 const URI_UPDATE_PROMPT_DIALOG  = "chrome://mozapps/content/update/updates.xul";
 
 const ADDON_ID_SUFFIX = "@appupdatetest.mozilla.org";
 const ADDON_PREP_DIR = "appupdateprep";
-
-const PREF_APP_UPDATE_LASTUPDATETIME = "app.update.lastUpdateTime.background-update-timer";
-
 // Preference for storing add-ons that are disabled by the tests to prevent them
 // from interefering with the tests.
 const PREF_DISABLEDADDONS = "app.update.test.disabledAddons";
 const PREF_EM_HOTFIX_ID = "extensions.hotfix.id";
 const PREF_EM_SILENT = "app.update.silent";
 const TEST_ADDONS = [ "appdisabled_1", "appdisabled_2",
                       "compatible_1", "compatible_2",
                       "noupdate_1", "noupdate_2",
@@ -875,21 +872,16 @@ function setupFiles() {
  * present so they can be set back to the original values when the test has
  * finished.
  */
 function setupPrefs() {
   if (DEBUG_AUS_TEST) {
     Services.prefs.setBoolPref(PREF_APP_UPDATE_LOG, true);
   }
 
-  // Prevent nsIUpdateTimerManager from notifying nsIApplicationUpdateService
-  // to check for updates by setting the last update time to the maximum value
-  // allowed for an integer preference.
-  Services.prefs.setIntPref(PREF_APP_UPDATE_LASTUPDATETIME, 2147483647);
-
   if (Services.prefs.prefHasUserValue(PREF_APP_UPDATE_URL_OVERRIDE)) {
     gAppUpdateURL = Services.prefs.getCharPref(PREF_APP_UPDATE_URL_OVERRIDE);
   }
 
   if (Services.prefs.prefHasUserValue(PREF_APP_UPDATE_ENABLED)) {
     gAppUpdateEnabled = Services.prefs.getBoolPref(PREF_APP_UPDATE_ENABLED);
   }
   Services.prefs.setBoolPref(PREF_APP_UPDATE_ENABLED, true);