diff --git a/websocket-sharp/Net/HttpListenerContext.cs b/websocket-sharp/Net/HttpListenerContext.cs
index 15f55702..638078d4 100644
--- a/websocket-sharp/Net/HttpListenerContext.cs
+++ b/websocket-sharp/Net/HttpListenerContext.cs
@@ -195,6 +195,11 @@ namespace WebSocketSharp.Net
       return true;
     }
 
+    internal bool Register ()
+    {
+      return _listener.RegisterContext (this);
+    }
+
     internal void Unregister ()
     {
       _listener.UnregisterContext (this);