diff --git a/modules/opd_presentations/src/Action/CountGivenPresentations.php b/modules/opd_presentations/src/Action/CountGivenPresentations.php
index 1c3b14257..21ae7fa48 100644
--- a/modules/opd_presentations/src/Action/CountGivenPresentations.php
+++ b/modules/opd_presentations/src/Action/CountGivenPresentations.php
@@ -7,7 +7,7 @@ namespace Drupal\opd_presentations\Action;
 use Drupal\opd_presentations\Presentation;
 use Drupal\opd_presentations\Repository\PresentationRepositoryInterface;
 
-final class CountGivenPresentations {
+readonly final class CountGivenPresentations {
 
   public function __construct(private PresentationRepositoryInterface $presentationRepository) {
   }