diff --git a/websocket-sharp/Net/HttpListenerPrefix.cs b/websocket-sharp/Net/HttpListenerPrefix.cs
index d66de982..3c9b0f8a 100644
--- a/websocket-sharp/Net/HttpListenerPrefix.cs
+++ b/websocket-sharp/Net/HttpListenerPrefix.cs
@@ -99,10 +99,6 @@ namespace WebSocketSharp.Net
       get {
         return _listener;
       }
-
-      set {
-        _listener = value;
-      }
     }
 
     public string Original {