diff --git a/htdocs/core/class/commonobject.class.php b/htdocs/core/class/commonobject.class.php
index 88386521079..6e8edf4e3e8 100644
--- a/htdocs/core/class/commonobject.class.php
+++ b/htdocs/core/class/commonobject.class.php
@@ -5053,7 +5053,7 @@ abstract class CommonObject
 	 *  @return int                 		-1=error, O=did nothing, 1=OK
 	 *  @see setValueFrom, insertExtraFields
 	 */
-	function updateExtraField($key, $trigger, $userused)
+	function updateExtraField($key, $trigger=null, $userused=null)
 	{
 		global $conf,$langs,$user;