diff --git a/kiri-websocket-server/Server.php b/kiri-websocket-server/Server.php
index 121c604b..2c7a292d 100644
--- a/kiri-websocket-server/Server.php
+++ b/kiri-websocket-server/Server.php
@@ -69,7 +69,7 @@ class Server extends AbstractServer
 			return;
 		}
 		if ($this->callback instanceof OnCloseInterface) {
-			$this->callback->onClose($server, $fd);
+			$this->callback->onClose($fd);
 		}
 	}