diff --git a/src/User/Model/Profile.php b/src/User/Model/Profile.php
index e08782f..450c878 100644
--- a/src/User/Model/Profile.php
+++ b/src/User/Model/Profile.php
@@ -125,7 +125,7 @@ class Profile extends ActiveRecord
      */
     public function setTimeZone(DateTimeZone $timezone)
     {
-        $this->setAttribute('timezone', $timezone);
+        $this->setAttribute('timezone', $timezone->getName());
     }
 
     /**