diff --git a/src/BaseMiddleware.php b/src/BaseMiddleware.php
index 7a974dc..7d25f70 100644
--- a/src/BaseMiddleware.php
+++ b/src/BaseMiddleware.php
@@ -42,10 +42,8 @@ public function __init(): void
 
     /**
      * 获取本机IP.
-     *
-     * @return string
      */
-    protected function getLocalIP()
+    protected function getLocalIP(): string
     {
         $list = swoole_get_local_ip();
         if ($this->interface)