diff --git a/installer/data/mysql/atomicupdate/bug_38663.pl b/installer/data/mysql/atomicupdate/bug_38663.pl
new file mode 100755
index 0000000000..1f2b0277fb
--- /dev/null
+++ b/installer/data/mysql/atomicupdate/bug_38663.pl
@@ -0,0 +1,21 @@
+use Modern::Perl;
+use Koha::Installer::Output qw(say_warning say_success say_info);
+
+return {
+    bug_number  => "38663",
+    description => "Add additional fields to libraries",
+    up          => sub {
+        my ($args) = @_;
+        my ( $dbh, $out ) = @$args{qw(dbh out)};
+
+        $dbh->do(q{ ALTER TABLE additional_field_values ADD COLUMN new_record_id VARCHAR(11) NOT NULL DEFAULT ''; });
+
+        $dbh->do(q{ UPDATE additional_field_values SET new_record_id = CAST(record_id AS CHAR(11)); });
+
+        $dbh->do(q{ ALTER TABLE additional_field_values DROP COLUMN record_id; });
+
+        $dbh->do(q{ ALTER TABLE additional_field_values RENAME COLUMN new_record_id TO record_id; });
+
+        say_success( $out, "Converted record_id to VARCHAR" );
+    },
+};
diff --git a/installer/data/mysql/kohastructure.sql b/installer/data/mysql/kohastructure.sql
index 6609f12bc0..9b7dc7fc6e 100644
--- a/installer/data/mysql/kohastructure.sql
+++ b/installer/data/mysql/kohastructure.sql
@@ -247,7 +247,7 @@ DROP TABLE IF EXISTS `additional_field_values`;
 CREATE TABLE `additional_field_values` (
   `id` int(11) NOT NULL AUTO_INCREMENT COMMENT 'primary key identifier',
   `field_id` int(11) NOT NULL COMMENT 'foreign key references additional_fields(id)',
-  `record_id` int(11) NOT NULL COMMENT 'record_id',
+  `record_id` varchar(11) NOT NULL COMMENT 'record_id',
   `value` varchar(255) NOT NULL DEFAULT '' COMMENT 'value for this field',
   PRIMARY KEY (`id`),
   KEY `afv_fk` (`field_id`),