diff --git a/HttpServer/Events/OnWorkerStart.php b/HttpServer/Events/OnWorkerStart.php
index f726d0bf..f605abd9 100644
--- a/HttpServer/Events/OnWorkerStart.php
+++ b/HttpServer/Events/OnWorkerStart.php
@@ -64,7 +64,7 @@ class OnWorkerStart extends Callback
 		if ($sigkill === false) {
 			return $server->stop($workerId);
 		}
-		while ($server->stats()['coroutine_num'] > 0) {
+		while ($server->stats()['coroutine_num'] > 1) {
 			Coroutine::sleep(0.01);
 		}
 		return $server->stop($workerId);