diff --git a/htdocs/public/payment/newpayment.php b/htdocs/public/payment/newpayment.php
index a3cedb24887..306e7b5bf72 100644
--- a/htdocs/public/payment/newpayment.php
+++ b/htdocs/public/payment/newpayment.php
@@ -66,6 +66,7 @@ if (is_numeric($entity)) {
 // Load Dolibarr environment
 require '../../main.inc.php';
 require_once DOL_DOCUMENT_ROOT.'/core/lib/company.lib.php';
+require_once DOL_DOCUMENT_ROOT.'/core/lib/files.lib.php';
 require_once DOL_DOCUMENT_ROOT.'/core/lib/payments.lib.php';
 require_once DOL_DOCUMENT_ROOT.'/core/lib/functions2.lib.php';
 require_once DOL_DOCUMENT_ROOT.'/eventorganization/class/conferenceorboothattendee.class.php';