diff --git a/htdocs/categories/class/categorie.class.php b/htdocs/categories/class/categorie.class.php
index 434b994ccd2..c1d5d241340 100644
--- a/htdocs/categories/class/categorie.class.php
+++ b/htdocs/categories/class/categorie.class.php
@@ -258,6 +258,12 @@ class Categorie extends CommonObject
 	 */
 	public $motherof = array();
 
+	/**
+	 * @var array Childs
+	 */
+	public $childs = array();
+
+
 	/**
 	 *	Constructor
 	 *