diff --git a/htdocs/resource/class/dolresource.class.php b/htdocs/resource/class/dolresource.class.php
index ad3355e3972..bb7aad6dd57 100644
--- a/htdocs/resource/class/dolresource.class.php
+++ b/htdocs/resource/class/dolresource.class.php
@@ -56,7 +56,9 @@ class Dolresource extends CommonObject
 	public $type_label;
 	public $tms='';
 
-	var $oldcopy;
+	public $cache_code_type_resource=array();
+
+	public $oldcopy;
 
     /**
      *  Constructor
@@ -66,6 +68,7 @@ class Dolresource extends CommonObject
     function __construct($db)
     {
         $this->db = $db;
+
     }
 
     /**