diff --git a/htdocs/takepos/invoice.php b/htdocs/takepos/invoice.php
index d30adb72ef0..09a60ffc3e9 100644
--- a/htdocs/takepos/invoice.php
+++ b/htdocs/takepos/invoice.php
@@ -35,6 +35,7 @@ if (!defined('NOREQUIREAJAX'))  { define('NOREQUIREAJAX', '1'); }
 require '../main.inc.php';
 require_once DOL_DOCUMENT_ROOT . '/compta/facture/class/facture.class.php';
 require_once DOL_DOCUMENT_ROOT . '/compta/paiement/class/paiement.class.php';
+require_once DOL_DOCUMENT_ROOT . '/core/class/html.form.class.php';
 
 $langs->loadLangs(array("bills", "cashdesk"));
 
@@ -352,7 +353,7 @@ if ($action=="valid")
         else $sectionwithinvoicelink.=$langs->trans('BillShortStatusValidated');
     }
     $sectionwithinvoicelink.='</span>';
-    if ($conf->global->TAKEPOSCONNECTOR) $sectionwithinvoicelink.=' <button type="button" onclick="TakeposPrinting('.$placeid.');">'.$langs->trans('PrintTicket').'</button>';
+    if ($conf->global->TAKEPOSCONNECTOR) $sectionwithinvoicelink.=' <button id="buttonprint" type="button" onclick="TakeposPrinting('.$placeid.');">'.$langs->trans('PrintTicket').'</button>';
     else $sectionwithinvoicelink.=' <button id="buttonprint" type="button" onclick="Print('.$placeid.');">'.$langs->trans('PrintTicket').'</button>';
     if ($conf->global->TAKEPOS_AUTO_PRINT_TICKETS) $sectionwithinvoicelink.='<script language="javascript">$("#buttonprint").click();</script>';
 }