diff --git a/not_cloudflare/list_error403.txt b/not_cloudflare/list_error403.txt
index 303fe319f4..c8fbee188f 100644
--- a/not_cloudflare/list_error403.txt
+++ b/not_cloudflare/list_error403.txt
@@ -54,6 +54,7 @@ retailmenot.com
 rijksoverheid.nl
 riteaid.com
 safeco.com
+sec.gov
 securifi.com
 signon.ruc.dk
 singpolyma.net