diff --git a/lib/SaferpayJson/Request/Container/RequestHeader.php b/lib/SaferpayJson/Request/Container/RequestHeader.php
index 6b943ca..3abb234 100644
--- a/lib/SaferpayJson/Request/Container/RequestHeader.php
+++ b/lib/SaferpayJson/Request/Container/RequestHeader.php
@@ -22,12 +22,12 @@ final class RequestHeader
     /**
      * @SerializedName("RequestId")
      */
-    private ?string $requestId = null;
+    private ?string $requestId;
 
     /**
      * @SerializedName("RetryIndicator")
      */
-    private int $retryIndicator = 0;
+    private int $retryIndicator;
 
     /**
      * @SerializedName("ClientInfo")