diff --git a/websocket-sharp/Server/WebSocketServer.cs b/websocket-sharp/Server/WebSocketServer.cs
index d11f1a4e..3620c37c 100644
--- a/websocket-sharp/Server/WebSocketServer.cs
+++ b/websocket-sharp/Server/WebSocketServer.cs
@@ -1488,6 +1488,7 @@ namespace WebSocketSharp.Server
     /// <exception cref="InvalidOperationException">
     /// The underlying <see cref="TcpListener"/> has failed to stop.
     /// </exception>
+    [Obsolete ("This method will be removed.")]
     public void Stop (CloseStatusCode code, string reason)
     {
       if (code == CloseStatusCode.MandatoryExtension) {