diff --git a/config/config.php b/config/config.php
index 046e36a2..f89c1746 100755
--- a/config/config.php
+++ b/config/config.php
@@ -22,6 +22,9 @@ define('RASPI_OPENVPN_SERVER_CONFIG', '/etc/openvpn/server/server.conf');
 define('RASPI_TORPROXY_CONFIG', '/etc/tor/torrc');
 define('RASPI_LIGHTTPD_CONFIG', '/etc/lighttpd/lighttpd.conf');
 
+// Constants for CRDA wireless regulatory domain
+define('RASPI_5GHZ_ISO_ALPHA2', array('US'));
+
 // Optional services, set to true to enable.
 define('RASPI_WIFICLIENT_ENABLED', true);
 define('RASPI_HOTSPOT_ENABLED', true);