diff --git a/chrome/content/zotero/preferences/preferences_sync.js b/chrome/content/zotero/preferences/preferences_sync.js
index 4b3af6a883..c37c3b9277 100644
--- a/chrome/content/zotero/preferences/preferences_sync.js
+++ b/chrome/content/zotero/preferences/preferences_sync.js
@@ -334,9 +334,7 @@ Zotero_Preferences.Sync = {
 						// TODO: better way of checking for an active session?
 						if (Zotero.Sync.Server.sessionIDComponent == 'sessionid=') {
 							Zotero.Sync.Server.login()
-							.then(function () {
-								callback();
-							})
+							.then(callback)
 							.done();
 						}
 						else {