diff --git a/install/sql/incremental/upd_0065.sql b/install/sql/incremental/upd_0065.sql
index ccc790c035eda18e7f6d91ebd14d7979fd3a3ec0..767e9b6c4bbe6b337b8fb244b405533325020edc 100644
--- a/install/sql/incremental/upd_0065.sql
+++ b/install/sql/incremental/upd_0065.sql
@@ -1,7 +1,7 @@
 ALTER TABLE `web_backup` ADD `filesize` VARCHAR(10) NOT NULL AFTER `filename`;
 ALTER TABLE `client_template` CHANGE `limit_aps` `limit_aps` INT( 11 ) NOT NULL DEFAULT '-1';
-ALTER TABLE `mail_domain` ADD `dkim_public` MEDIUMTEXT NOT NULL AFTER `domain`;
-ALTER TABLE `mail_domain` ADD `dkim_private` MEDIUMTEXT NOT NULL AFTER `domain`;
+ALTER TABLE `mail_domain` ADD `dkim_public` MEDIUMTEXT NULL AFTER `domain`;
+ALTER TABLE `mail_domain` ADD `dkim_private` MEDIUMTEXT NULL AFTER `domain`;
 ALTER TABLE `mail_domain` ADD `dkim` ENUM( 'n', 'y' ) NOT NULL AFTER `domain`;
 ALTER TABLE `web_backup` CHANGE `backup_type` `backup_type` enum('web','mysql','mongodb') NOT NULL DEFAULT 'web';
 ALTER TABLE `web_database_user` ADD `database_password_mongo` varchar(32) DEFAULT NULL AFTER `database_password`;
diff --git a/install/sql/ispconfig3.sql b/install/sql/ispconfig3.sql
index 9e2d6c880e1fc764dc83f2f96df0467b91ad87fd..009daa7fe6cdecc733eb69aaf8866779541abbc7 100644
--- a/install/sql/ispconfig3.sql
+++ b/install/sql/ispconfig3.sql
@@ -740,8 +740,8 @@ CREATE TABLE `mail_domain` (
   `server_id` int(11) unsigned NOT NULL default '0',
   `domain` varchar(255) NOT NULL default '',
   `dkim` ENUM( 'n', 'y' ) NOT NULL default 'n',
-  `dkim_private` mediumtext NOT NULL,
-  `dkim_public` mediumtext NOT NULL,
+  `dkim_private` mediumtext NULL,
+  `dkim_public` mediumtext NULL,
   `active` enum('n','y') NOT NULL,
   PRIMARY KEY  (`domain_id`),
   KEY `server_id` (`server_id`,`domain`),