diff --git a/src/Bundle/ChillCalendarBundle/Export/Filter/ScopeFilter.php b/src/Bundle/ChillCalendarBundle/Export/Filter/ScopeFilter.php
index e89f00b52..e8171dbf2 100644
--- a/src/Bundle/ChillCalendarBundle/Export/Filter/ScopeFilter.php
+++ b/src/Bundle/ChillCalendarBundle/Export/Filter/ScopeFilter.php
@@ -30,7 +30,7 @@ class ScopeFilter implements FilterInterface
     private const PREFIX = 'cal_filter_scope';
 
     public function __construct(
-        private RollingDateConverter $rollingDateConverter,
+        private readonly RollingDateConverter $rollingDateConverter,
         protected TranslatorInterface $translator,
         private readonly TranslatableStringHelper $translatableStringHelper
     ) {}