diff --git a/src/Protocols/Pusher/Http/Controllers/PusherController.php b/src/Protocols/Pusher/Http/Controllers/PusherController.php
index c2adbf6f..1819cec9 100644
--- a/src/Protocols/Pusher/Http/Controllers/PusherController.php
+++ b/src/Protocols/Pusher/Http/Controllers/PusherController.php
@@ -31,7 +31,7 @@ public function __invoke(RequestInterface $request, Connection $connection, stri
         $connection->withMaxMessageSize($reverbConnection->app()->maxMessageSize());
 
         $connection->onMessage(
-            fn (string $message) => $this->server->message($reverbConnection, $message)
+            fn ($message) => $this->server->message($reverbConnection, (string) $message)
         );
 
         $connection->onClose(