diff --git a/toolkit/mozapps/update/nsUpdateService.js b/toolkit/mozapps/update/nsUpdateService.js
index 2a8805f78..b8e39af52 100644
--- a/toolkit/mozapps/update/nsUpdateService.js
+++ b/toolkit/mozapps/update/nsUpdateService.js
@@ -38,7 +38,7 @@ const PREF_APP_UPDATE_SOCKET_MAXERRORS     = "app.update.socket.maxErrors";
 const PREF_APP_UPDATE_SOCKET_RETRYTIMEOUT  = "app.update.socket.retryTimeout";
 const PREF_APP_UPDATE_STAGING_ENABLED      = "app.update.staging.enabled";
 const PREF_APP_UPDATE_URL                  = "app.update.url";
-const PREF_APP_UPDATE_URL_DETAILS          = "app.update.url.details";
+const PREF_APP_UPDATE_URL_DETAILS          = "app.releaseNotesURL";
 const PREF_APP_UPDATE_URL_OVERRIDE         = "app.update.url.override";
 
 const PREFBRANCH_APP_UPDATE_NEVER = "app.update.never.";