diff --git a/htdocs/resource/list.php b/htdocs/resource/list.php
index e5cbcc22d67..356df3a746e 100644
--- a/htdocs/resource/list.php
+++ b/htdocs/resource/list.php
@@ -1,7 +1,7 @@
 <?php
 /* Copyright (C) 2013-2014  Jean-François Ferry     <jfefe@aternatik.fr>
  * Copyright (C) 2018       Nicolas ZABOURI         <info@inovea-conseil.com>
- * Copyright (C) 2018-2019  Frédéric France         <frederic.france@netlogic.fr>
+ * Copyright (C) 2018-2021  Frédéric France         <frederic.france@netlogic.fr>
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -40,6 +40,7 @@ $resource_id    = GETPOST('resource_id', 'int');
 
 $sortorder      = GETPOST('sortorder', 'alpha');
 $sortfield      = GETPOST('sortfield', 'aZ09comma');
+$optioncss = GETPOST('optioncss', 'alpha');
 
 // Initialize context for list
 $contextpage = GETPOST('contextpage', 'aZ') ?GETPOST('contextpage', 'aZ') : 'resourcelist';