diff --git a/cloudron.js b/cloudron.js
index ff238e9..de552b1 100644
--- a/cloudron.js
+++ b/cloudron.js
@@ -324,7 +324,7 @@ Cloudron.prototype.reboot = function () {
 Cloudron.prototype.checkTimeZone = function (tz) {
     var res = request.get(this._origin + '/api/v1/settings/time_zone').query({ access_token: this._credentials.accessToken }).end();
     common.verifyResponse2xx(res, 'Could not query timezone');
-    if (tz !== res.body.timeZone) throw new Error('timezone does not match. expecting: %s got %s', tz, result.body.timeZone);
+    if (tz !== res.body.timeZone) throw new Error('timezone does not match. expecting: ' + tz + ' got ' + res.body.timeZone);
 };
 
 Cloudron.prototype.checkA = function (callback) {