diff --git a/htdocs/core/class/html.formmail.class.php b/htdocs/core/class/html.formmail.class.php
index 29ccbde0f02..96c99ebba36 100644
--- a/htdocs/core/class/html.formmail.class.php
+++ b/htdocs/core/class/html.formmail.class.php
@@ -319,6 +319,10 @@ class FormMail extends Form
// phpcs:enable
global $conf, $langs, $user, $hookmanager, $form;
+ // Required to show preview of mail attachments
+ require_once DOL_DOCUMENT_ROOT.'/core/class/html.formfile.class.php';
+ $formfile = new Formfile($this->db);
+
if (!is_object($form)) $form = new Form($this->db);
// Load translation files required by the page
@@ -845,7 +849,10 @@ class FormMail extends Form
foreach ($listofpaths as $key => $val)
{
$out .= '