diff --git a/websocket-sharp/Net/EndPointManager.cs b/websocket-sharp/Net/EndPointManager.cs
index 1fe0aaee..5503f737 100644
--- a/websocket-sharp/Net/EndPointManager.cs
+++ b/websocket-sharp/Net/EndPointManager.cs
@@ -80,7 +80,7 @@ namespace WebSocketSharp.Net
 
     private static void addPrefix (string uriPrefix, HttpListener listener)
     {
-      var pref = new HttpListenerPrefix (uriPrefix);
+      var pref = new HttpListenerPrefix (uriPrefix, listener);
 
       var addr = convertToIPAddress (pref.Host);