diff --git a/websocket-sharp/Net/HttpListenerContext.cs b/websocket-sharp/Net/HttpListenerContext.cs
index 30410677..3ef2727a 100644
--- a/websocket-sharp/Net/HttpListenerContext.cs
+++ b/websocket-sharp/Net/HttpListenerContext.cs
@@ -236,7 +236,7 @@ namespace WebSocketSharp.Net
                       );
 
         var enc = Encoding.UTF8;
-        var entity = enc.GetBytes (content.ToString ());
+        var entity = enc.GetBytes (content);
         _response.ContentEncoding = enc;
         _response.ContentLength64 = entity.LongLength;