diff --git a/htdocs/core/class/html.form.class.php b/htdocs/core/class/html.form.class.php
index 0943bce1e87..0c5fe571eda 100644
--- a/htdocs/core/class/html.form.class.php
+++ b/htdocs/core/class/html.form.class.php
@@ -3160,7 +3160,7 @@ class Form
      */
     function form_contacts($page, $societe, $selected='', $htmlname='contactidp')
     {
-        global $langs;
+        global $langs, $conf;
 
         if ($htmlname != "none")
         {