diff --git a/htdocs/don/class/don.class.php b/htdocs/don/class/don.class.php
index d2786cd2a79..77dbd177cbd 100644
--- a/htdocs/don/class/don.class.php
+++ b/htdocs/don/class/don.class.php
@@ -922,7 +922,7 @@ class Don extends CommonObject
      */
     public function getNomUrl($withpicto = 0, $notooltip = 0)
     {
-        global $langs;
+        global $conf, $langs;
 
         if (!empty($conf->dol_no_mouse_hover)) $notooltip = 1; // Force disable tooltips