diff --git a/src/Annotation/MQTTPublish.php b/src/Annotation/MQTTPublish.php
index ec094f6..7050b1f 100644
--- a/src/Annotation/MQTTPublish.php
+++ b/src/Annotation/MQTTPublish.php
@@ -20,5 +20,5 @@ class MQTTPublish extends MQTTEvent
     /**
      * @var int
      */
-    public $type = Types::PUBLISH;
+    public int $type = Types::PUBLISH;
 }