diff --git a/src/Types/MessageOriginHiddenUser.php b/src/Types/MessageOriginHiddenUser.php
index 3e37b750..5adee031 100644
--- a/src/Types/MessageOriginHiddenUser.php
+++ b/src/Types/MessageOriginHiddenUser.php
@@ -25,7 +25,7 @@ public function getSenderUserName()
         return $this->senderUserName;
     }
 
-    public function setSenderUserName(User $senderUserName)
+    public function setSenderUserName(string $senderUserName)
     {
         $this->senderUserName = $senderUserName;
     }