diff --git a/Ui/Component/Listing/Column/Datetime.php b/Ui/Component/Listing/Column/Datetime.php
index 19bcbff..c3e5ff5 100644
--- a/Ui/Component/Listing/Column/Datetime.php
+++ b/Ui/Component/Listing/Column/Datetime.php
@@ -67,8 +67,8 @@ public function __construct(
         BooleanUtils $booleanUtils,
         array $components = [],
         array $data = [],
-        ResolverInterface $localeResolver = null,
-        DataBundle $dataBundle = null
+        ?ResolverInterface $localeResolver = null,
+        ?DataBundle $dataBundle = null
     ) {
         $this->timezone = $timezone;
         $this->booleanUtils = $booleanUtils;