diff --git a/src/RejectionResultBucket.php b/src/RejectionResultBucket.php
index 67e786e..8f13db6 100644
--- a/src/RejectionResultBucket.php
+++ b/src/RejectionResultBucket.php
@@ -18,7 +18,7 @@ final class RejectionResultBucket implements Contract\RejectionResultBucketInter
 
     /** @param Type ...$values */
     public function __construct(
-        private readonly string $reason,
+        private readonly ?string $reason,
         private readonly ?\Throwable $exception,
         ...$values,
     ) {