diff --git a/HttpServer/Events/OnWorkerStart.php b/HttpServer/Events/OnWorkerStart.php
index 7395e86c..3b41161e 100644
--- a/HttpServer/Events/OnWorkerStart.php
+++ b/HttpServer/Events/OnWorkerStart.php
@@ -45,7 +45,7 @@ class OnWorkerStart extends Callback
 		} else {
 			$this->onWorker($server, $worker_id);
 		}
-		$this->debug(sprintf('%s#%d start.', env('environmental'), $worker_id));
+		$this->debug(sprintf('%s#%d start.', ucfirst(env('environmental')), $worker_id));
 		Coroutine\go([$this, 'onSignal'], $server, $worker_id);
 	}