diff --git a/notifications/inc/class.iface_notification.inc.php b/notifications/inc/class.iface_notification.inc.php
index 0eef4a789e..3cd8338ec2 100644
--- a/notifications/inc/class.iface_notification.inc.php
+++ b/notifications/inc/class.iface_notification.inc.php
@@ -20,7 +20,7 @@ interface iface_notification {
 	 * @param object $_account
 	 * @param object $_preferences
 	 */
-	public function __construct( $_account, $_preferences );
+	public function __construct( $_account=false, $_preferences=false );
 	
 	/**
 	 * sends notification