diff --git a/htdocs/public/payment/paymentok.php b/htdocs/public/payment/paymentok.php
index 303b3236472..c9b8f13c877 100644
--- a/htdocs/public/payment/paymentok.php
+++ b/htdocs/public/payment/paymentok.php
@@ -1278,7 +1278,6 @@ if ($ispaymentok) {
 								$msg = $outputlangs->trans("OrganizationEventPaymentOfRegistrationWasReceived");
 							}
 
-
 							$substitutionarray = getCommonSubstitutionArray($outputlangs, 0, null, $thirdparty);
 							complete_substitutions_array($substitutionarray, $outputlangs, $object);
 
@@ -1291,7 +1290,22 @@ if ($ispaymentok) {
 
 							$ishtml = dol_textishtml($texttosend); // May contain urls
 
-							$mailfile = new CMailFile($subjecttosend, $sendto, $from, $texttosend, array(), array(), array(), '', '', 0, $ishtml);
+							// Attach a file ?
+							$file = '';
+							$listofpaths = array();
+							$listofnames = array();
+							$listofmimes = array();
+							if (is_object($object)) {
+								$invoicediroutput = $conf->facture->dir_output;
+								$fileparams = dol_most_recent_file($invoicediroutput.'/'.$object->ref, preg_quote($object->ref, '/').'[^\-]+');
+								$file = $fileparams['fullname'];
+
+								$listofpaths = array($file);
+								$listofnames = array(basename($file));
+								$listofmimes = array(dol_mimetype($file));
+							}
+
+							$mailfile = new CMailFile($subjecttosend, $sendto, $from, $texttosend, $listofpaths, $listofmimes, $listofnames, '', '', 0, $ishtml);
 
 							$result = $mailfile->sendfile();
 							if ($result) {