diff --git a/websocket-sharp/Net/WebSockets/TcpListenerWebSocketContext.cs b/websocket-sharp/Net/WebSockets/TcpListenerWebSocketContext.cs
index 69f8f7c9..04f9c442 100644
--- a/websocket-sharp/Net/WebSockets/TcpListenerWebSocketContext.cs
+++ b/websocket-sharp/Net/WebSockets/TcpListenerWebSocketContext.cs
@@ -474,7 +474,7 @@ namespace WebSocketSharp.Net.WebSockets
             return true;
           }
 
-          SendAuthenticationChallenge (chal);
+          _request = sendAuthenticationChallenge (chal);
           return auth ();
         };