diff --git a/websocket-sharp/Net/HttpConnection.cs b/websocket-sharp/Net/HttpConnection.cs
index e805144a..a60d4f70 100644
--- a/websocket-sharp/Net/HttpConnection.cs
+++ b/websocket-sharp/Net/HttpConnection.cs
@@ -405,7 +405,7 @@ namespace WebSocketSharp.Net
       if (!_contextRegistered)
         return;
 
-      _context.Listener.UnregisterContext (_context);
+      _context.Unregister ();
       _contextRegistered = false;
     }