diff --git a/classes/controller/AdminController.php b/classes/controller/AdminController.php
index 0ee378e9b..029a7bdf9 100644
--- a/classes/controller/AdminController.php
+++ b/classes/controller/AdminController.php
@@ -3500,9 +3500,9 @@ class AdminControllerCore extends Controller
                 foreach ($languages as $language) {
                     if (($value = Tools::getValue($field_lang.'_'.$language['id_lang'])) !== false && !empty($value)) {
                         if (Tools::strtolower($function) == 'iscleanhtml' && Configuration::get('PS_ALLOW_HTML_IFRAME')) {
-                            $res = Validate::$function($value, true);
+                            $res = Validate::{$function}($value, true);
                         } else {
-                            $res = Validate::$function($value);
+                            $res = Validate::{$function}($value);
                         }
                         if (!$res) {
                             $this->errors[$field_lang.'_'.$language['id_lang']] = sprintf(