diff --git a/websocket-sharp/Net/ResponseStream.cs b/websocket-sharp/Net/ResponseStream.cs
index 4d001e3c..23435d8b 100644
--- a/websocket-sharp/Net/ResponseStream.cs
+++ b/websocket-sharp/Net/ResponseStream.cs
@@ -298,8 +298,10 @@ namespace WebSocketSharp.Net
 
     public override void EndWrite (IAsyncResult asyncResult)
     {
-      if (_disposed)
-        throw new ObjectDisposedException (GetType ().ToString ());
+      if (_disposed) {
+        var name = GetType ().ToString ();
+        throw new ObjectDisposedException (name);
+      }
 
       _body.EndWrite (asyncResult);
     }