diff --git a/src/Transport/Result.php b/src/Transport/Result.php
index 7d5061bc4..881624f11 100644
--- a/src/Transport/Result.php
+++ b/src/Transport/Result.php
@@ -10,7 +10,7 @@
  * This class contains the details of the sending operation of an event, e.g.
  * if it was sent successfully or if it was skipped because of some reason.
  */
-class Result
+final class Result
 {
     /**
      * @var ResultStatus The status of the sending operation of the event