diff --git a/classes/class.ilObjMindmapGUI.php b/classes/class.ilObjMindmapGUI.php
index 9e33397..e57853a 100644
--- a/classes/class.ilObjMindmapGUI.php
+++ b/classes/class.ilObjMindmapGUI.php
@@ -23,6 +23,16 @@
 */
 class ilObjMindmapGUI extends ilObjectPluginGUI
 {
+	/**
+ 	* Property form
+  	*/
+	private $form;
+
+	/**
+ 	* Data directory
+  	*/
+	private $dataDir;
+
 	/**
 	* Initialisation
 	*/