diff --git a/htdocs/compta/dons/class/don.class.php b/htdocs/compta/dons/class/don.class.php
index 591df7333a5..416e0d9434c 100644
--- a/htdocs/compta/dons/class/don.class.php
+++ b/htdocs/compta/dons/class/don.class.php
@@ -36,6 +36,7 @@ class Don extends CommonObject
     public $table_element='don';
 
     var $id;
+    var $ref;
     var $date;
     var $amount;
     var $prenom;