diff --git a/certs/openssl.cnf b/certs/openssl.cnf
index 9e72abe4b..44fc04241 100644
--- a/certs/openssl.cnf
+++ b/certs/openssl.cnf
@@ -22,7 +22,7 @@ prompt = no
 [ distinguished_name ]
 
 commonName             = example.com
-countryName            = UK
+countryName            = GB
 localityName           = The Internet
 organizationName       = Your Organisation
 organizationalUnitName = XMPP Department