diff --git a/kiri-engine/FileListen/HotReload.php b/kiri-engine/FileListen/HotReload.php
index 95ecb8de..d46637e7 100644
--- a/kiri-engine/FileListen/HotReload.php
+++ b/kiri-engine/FileListen/HotReload.php
@@ -78,7 +78,7 @@ class HotReload extends Command
         $this->trigger_reload();
         Coroutine::create(function () {
             Coroutine::create(function () {
-                $this->onSignal(Coroutine::waitSignal(SIGKILL & SIGTERM, -1));
+                $this->onSignal(Coroutine::waitSignal(SIGKILL | SIGTERM, -1));
             });
             $this->driver->start();
         });