diff --git a/kiri-engine/FileListen/FileChangeCustomProcess.php b/kiri-engine/FileListen/FileChangeCustomProcess.php
index bf99ee64..5e642636 100644
--- a/kiri-engine/FileListen/FileChangeCustomProcess.php
+++ b/kiri-engine/FileListen/FileChangeCustomProcess.php
@@ -109,7 +109,7 @@ class FileChangeCustomProcess extends Command
 		$content = file_get_contents(storage('.swoole.pid'));
 
 		if (!empty($content)) {
-			Process::kill(storage('.swoole.pid'), 15);
+			Process::kill((int)storage('.swoole.pid'), 15);
 			proc_close($this->source);
 		}