diff --git a/websocket-sharp/Net/CookieCollection.cs b/websocket-sharp/Net/CookieCollection.cs
index a48a07d9..93da73e5 100644
--- a/websocket-sharp/Net/CookieCollection.cs
+++ b/websocket-sharp/Net/CookieCollection.cs
@@ -529,7 +529,7 @@ namespace WebSocketSharp.Net
         if (cookie != null)
           ret.add (cookie);
 
-        cookie = new Cookie (name, val);
+        Cookie.TryCreateCookie (name, val, out cookie);
       }
 
       if (cookie != null)