diff --git a/websocket-sharp/Net/RequestStream.cs b/websocket-sharp/Net/RequestStream.cs
index 8cf63669..f5bf784e 100644
--- a/websocket-sharp/Net/RequestStream.cs
+++ b/websocket-sharp/Net/RequestStream.cs
@@ -218,8 +218,11 @@ namespace WebSocketSharp.Net
 
     public override int EndRead (IAsyncResult asyncResult)
     {
-      if (_disposed)
-        throw new ObjectDisposedException (GetType ().ToString ());
+      if (_disposed) {
+        var name = GetType ().ToString ();
+
+        throw new ObjectDisposedException (name);
+      }
 
       if (asyncResult == null)
         throw new ArgumentNullException ("asyncResult");