diff --git a/htdocs/core/class/commonobject.class.php b/htdocs/core/class/commonobject.class.php
index 99e497046e0..704bc097db7 100644
--- a/htdocs/core/class/commonobject.class.php
+++ b/htdocs/core/class/commonobject.class.php
@@ -2540,7 +2540,7 @@ abstract class CommonObject
 	 */
 	function printObjectLines($action, $seller, $buyer, $selected=0, $dateSelector=0)
 	{
-		global $conf,$langs,$user,$object,$hookmanager;
+		global $conf,$langs,$user,$object,$hookmanager,$inputalsopricewithtax;
 
 		print '<tr class="liste_titre nodrag nodrop">';