diff --git a/lib/connection.js b/lib/connection.js
index 6e249a5..6354031 100644
--- a/lib/connection.js
+++ b/lib/connection.js
@@ -881,7 +881,7 @@ FTP.prototype.lastMod = function(path, cb) {
     if (!val)
       return cb(new Error('Invalid date/time format from server'));
     ret = new Date(val.year + '-' + val.month + '-' + val.date + 'T' + val.hour
-                   + ':' + val.minute + ':' + val.second);
+                   + ':' + val.minute + ':' + val.second + 'Z');
     cb(undefined, ret);
   });
 };