diff --git a/websocket-sharp/CloseEventArgs.cs b/websocket-sharp/CloseEventArgs.cs
index 21ee1641..8127ce41 100644
--- a/websocket-sharp/CloseEventArgs.cs
+++ b/websocket-sharp/CloseEventArgs.cs
@@ -106,10 +106,6 @@ namespace WebSocketSharp
       get {
         return _clean;
       }
-
-      internal set {
-        _clean = value;
-      }
     }
 
     #endregion