diff --git a/websocket-sharp/Net/CookieCollection.cs b/websocket-sharp/Net/CookieCollection.cs
index 0aaf456a..417b8fd0 100644
--- a/websocket-sharp/Net/CookieCollection.cs
+++ b/websocket-sharp/Net/CookieCollection.cs
@@ -332,7 +332,7 @@ namespace WebSocketSharp.Net
         }
         else if (pair.StartsWith ("comment", StringComparison.InvariantCultureIgnoreCase)) {
           if (cookie != null)
-            cookie.Comment = HttpUtility.UrlDecode (pair.GetValue ('='));
+            cookie.Comment = urlDecode (pair.GetValue ('='), Encoding.UTF8);
         }
         else if (pair.StartsWith ("commenturl", StringComparison.InvariantCultureIgnoreCase)) {
           if (cookie != null)