diff --git a/websocket-sharp/Net/CookieCollection.cs b/websocket-sharp/Net/CookieCollection.cs
index cd454d31..b63344f7 100644
--- a/websocket-sharp/Net/CookieCollection.cs
+++ b/websocket-sharp/Net/CookieCollection.cs
@@ -644,7 +644,7 @@ namespace WebSocketSharp.Net
       if (cookies == null)
         throw new ArgumentNullException ("cookies");
 
-      foreach (Cookie cookie in cookies)
+      foreach (var cookie in cookies._list)
         add (cookie);
     }