diff --git a/websocket-sharp/Server/WebSocketServer.cs b/websocket-sharp/Server/WebSocketServer.cs
index 3620c37c..2f0d6236 100644
--- a/websocket-sharp/Server/WebSocketServer.cs
+++ b/websocket-sharp/Server/WebSocketServer.cs
@@ -1344,7 +1344,7 @@ namespace WebSocketSharp.Server
     /// </exception>
     public void Stop ()
     {
-      stop (1005, String.Empty);
+      stop (1001, String.Empty);
     }
 
     /// <summary>