diff --git a/src/Validator/Constraints/UniqueEntityDto.php b/src/Validator/Constraints/UniqueEntityDto.php
index ba07c67..1a8851d 100644
--- a/src/Validator/Constraints/UniqueEntityDto.php
+++ b/src/Validator/Constraints/UniqueEntityDto.php
@@ -21,7 +21,7 @@ public function __construct(
         /** @var list<string> */
         public readonly array $errorAtPath = [],
         mixed $options = null,
-        array $groups = null,
+        ?array $groups = null,
         mixed $payload = null,
     ) {
         parent::__construct($options, $groups, $payload);