diff --git a/src/Bundle/ChillDocStoreBundle/Service/Signature/Driver/BaseSigner/PdfSignedMessage.php b/src/Bundle/ChillDocStoreBundle/Service/Signature/Driver/BaseSigner/PdfSignedMessage.php
index 3116e3b62..9368f188b 100644
--- a/src/Bundle/ChillDocStoreBundle/Service/Signature/Driver/BaseSigner/PdfSignedMessage.php
+++ b/src/Bundle/ChillDocStoreBundle/Service/Signature/Driver/BaseSigner/PdfSignedMessage.php
@@ -18,7 +18,7 @@ final readonly class PdfSignedMessage
 {
     public function __construct(
         public readonly int $signatureId,
-        public readonly int $signatureZoneIndex,
+        public readonly ?int $signatureZoneIndex,
         public readonly string $content,
     ) {}
 }