diff --git a/htdocs/ticket/class/ticket.class.php b/htdocs/ticket/class/ticket.class.php
index 144c26b055b..dc48fa775fb 100644
--- a/htdocs/ticket/class/ticket.class.php
+++ b/htdocs/ticket/class/ticket.class.php
@@ -82,6 +82,11 @@ class Ticket extends CommonObject
 	 */
 	public $fk_project;
 
+	/**
+	 * @var int Contract ID
+	 */
+	public $fk_contract;
+
 	/**
 	 * @var string Person email who have create ticket
 	 */