diff --git a/src/Bundle/ChillPersonBundle/Export/Filter/AccompanyingCourseFilters/UserWorkingOnCourseFilter.php b/src/Bundle/ChillPersonBundle/Export/Filter/AccompanyingCourseFilters/UserWorkingOnCourseFilter.php
index e73ef234a..42bb7dea3 100644
--- a/src/Bundle/ChillPersonBundle/Export/Filter/AccompanyingCourseFilters/UserWorkingOnCourseFilter.php
+++ b/src/Bundle/ChillPersonBundle/Export/Filter/AccompanyingCourseFilters/UserWorkingOnCourseFilter.php
@@ -28,7 +28,7 @@ use Symfony\Component\Form\FormBuilderInterface;
  *
  * Makes use of AccompanyingPeriodInfo
  */
-readonly class UserWorkingOnCourseFilter implements FilterInterface
+final readonly class UserWorkingOnCourseFilter implements FilterInterface
 {
     public function __construct(
         private UserRender $userRender,