diff --git a/lib/CalDAV/Schedule/IMipPlugin.php b/lib/CalDAV/Schedule/IMipPlugin.php
index e050ac273d..dcaf951efd 100644
--- a/lib/CalDAV/Schedule/IMipPlugin.php
+++ b/lib/CalDAV/Schedule/IMipPlugin.php
@@ -30,13 +30,6 @@ class IMipPlugin extends DAV\ServerPlugin
      */
     protected $senderEmail;
 
-    /**
-     * ITipMessage.
-     *
-     * @var ITip\Message
-     */
-    protected $itipMessage;
-
     /**
      * Creates the email handler.
      *