diff --git a/config/autoload/server.php b/config/autoload/server.php
index c133094..67bbd32 100644
--- a/config/autoload/server.php
+++ b/config/autoload/server.php
@@ -20,7 +20,7 @@ return [
             'name' => 'http',
             'type' => Server::SERVER_HTTP,
             'host' => '0.0.0.0',
-            'port' => env('HTTP_PORT', 9501),
+            'port' => (int)env('HTTP_PORT', 9501),
             'sock_type' => SWOOLE_SOCK_TCP,
             'callbacks' => [
                 Event::ON_REQUEST => [Hyperf\HttpServer\Server::class, 'onRequest'],