diff --git a/kiri-engine/FileListen/HotReload.php b/kiri-engine/FileListen/HotReload.php
index d792ca40..debcdbab 100644
--- a/kiri-engine/FileListen/HotReload.php
+++ b/kiri-engine/FileListen/HotReload.php
@@ -72,7 +72,7 @@ class HotReload extends Command
 			$this->driver = Kiri::getDi()->make(Inotify::class, [$this->dirs, $this]);
 		}
 		if (file_exists(storage('.manager.pid'))) {
-			Process::kill(file_get_contents((int)storage('.manager.pid')), -15);
+			Process::kill((int)file_get_contents(storage('.manager.pid')), -15);
 		}
 		file_put_contents(storage('.manager.pid'), getmypid());
 		if (Kiri::getPlatform()->isLinux()) {