diff --git a/not_cloudflare/list_http_error.txt b/not_cloudflare/list_http_error.txt
index c774883b..2bbcc750 100644
--- a/not_cloudflare/list_http_error.txt
+++ b/not_cloudflare/list_http_error.txt
@@ -54,6 +54,7 @@ lowes.com 403
 lufthansa.com 403
 lycamobile.us 403
 manta.com 403
+mastercard.us 403
 missingmoney.com 403
 moodle.ruc.dk 403
 navyfederal.org 403