diff --git a/websocket-sharp/Server/HttpServer.cs b/websocket-sharp/Server/HttpServer.cs
index 5e8db47c..d7b886d9 100644
--- a/websocket-sharp/Server/HttpServer.cs
+++ b/websocket-sharp/Server/HttpServer.cs
@@ -164,7 +164,7 @@ namespace WebSocketSharp.Server
       if (!tryCreateUri (url, out uri, out msg))
         throw new ArgumentException (msg, "url");
 
-      var host = getHost (uri);
+      var host = uri.GetDnsSafeHost (true);
 
       var addr = host.ToIPAddress ();
       if (addr == null) {