diff --git a/websocket-sharp/Net/CookieCollection.cs b/websocket-sharp/Net/CookieCollection.cs
index dac87df2..2fa6a61e 100644
--- a/websocket-sharp/Net/CookieCollection.cs
+++ b/websocket-sharp/Net/CookieCollection.cs
@@ -520,7 +520,7 @@ namespace WebSocketSharp.Net
         throw new ArgumentNullException ("cookies");
 
       foreach (Cookie cookie in cookies)
-        Add (cookie);
+        add (cookie);
     }
 
     /// <summary>