diff --git a/websocket-sharp/Server/HttpServer.cs b/websocket-sharp/Server/HttpServer.cs
index 81dc9849..198c6355 100644
--- a/websocket-sharp/Server/HttpServer.cs
+++ b/websocket-sharp/Server/HttpServer.cs
@@ -1488,7 +1488,7 @@ namespace WebSocketSharp.Server
     /// </remarks>
     public void Stop ()
     {
-      stop (1005, String.Empty);
+      stop (1001, String.Empty);
     }
 
     /// <summary>