diff --git a/htdocs/fichinter/class/fichinter.class.php b/htdocs/fichinter/class/fichinter.class.php
index d99dff39ce5..e373a55ec4c 100644
--- a/htdocs/fichinter/class/fichinter.class.php
+++ b/htdocs/fichinter/class/fichinter.class.php
@@ -86,6 +86,11 @@ class Fichinter extends CommonObject
 	 */
 	public $element = 'fichinter';
 
+	/**
+	 * @var string Name of field in database that is used as reference when object is linked to another one.
+	 */
+	public $fk_element = 'fk_fichinter';
+
 	/**
 	 * @var string Name of table without prefix where object is stored
 	 */