diff --git a/sql/tables/cat.sql b/sql/tables/cat.sql
index 55b64e49..98beddd4 100644
--- a/sql/tables/cat.sql
+++ b/sql/tables/cat.sql
@@ -7,4 +7,4 @@ CREATE TABLE IF NOT EXISTS `cat` (
   PRIMARY KEY  (`id`)
 ) ENGINE=InnoDB  DEFAULT CHARSET=latin1 ;
 
-ALTER TABLE `cat` ADD `downlink_freq` INT(11) NOT NULL AFTER `mode`, ADD `uplink_freq` INT(11) NOT NULL AFTER `downlink_freq`, ADD `downlink_mode` VARCHAR(255) NOT NULL AFTER `uplink_freq`, ADD `uplink_mode` VARCHAR(255) NOT NULL AFTER `downlink_mode`, ADD `sat_name` VARCHAR(255) NOT NULL AFTER `uplink_mode`;
\ No newline at end of file
+ALTER TABLE `cat` ADD `downlink_freq` INT(11) DEFAULT NULL AFTER `mode`, ADD `uplink_freq` INT(11) DEFAULT NULL AFTER `downlink_freq`, ADD `downlink_mode` VARCHAR(255) DEFAULT NULL AFTER `uplink_freq`, ADD `uplink_mode` VARCHAR(255) DEFAULT NULL AFTER `downlink_mode`, ADD `sat_name` VARCHAR(255) DEFAULT NULL AFTER `uplink_mode`;
\ No newline at end of file