diff --git a/installer/data/mysql/atomicupdate/bug_25086.perl b/installer/data/mysql/atomicupdate/bug_25086.perl
new file mode 100644
index 0000000000..183408e6d4
--- /dev/null
+++ b/installer/data/mysql/atomicupdate/bug_25086.perl
@@ -0,0 +1,9 @@
+$DBversion = 'XXX'; # will be replaced by the RM
+if( CheckVersion( $DBversion ) ) {
+    # you can use $dbh here like:
+
+    $dbh->do( "ALTER TABLE borrower_modifications MODIFY changed_fields MEDIUMTEXT DEFAULT NULL" );
+
+    # Always end with this (adjust the bug info)
+    NewVersion( $DBversion, 25086, "Set changed_fields column of borrower_modifications as nullable");
+}
diff --git a/installer/data/mysql/kohastructure.sql b/installer/data/mysql/kohastructure.sql
index 740b5958c8..97801a50e2 100644
--- a/installer/data/mysql/kohastructure.sql
+++ b/installer/data/mysql/kohastructure.sql
@@ -3387,7 +3387,7 @@ CREATE TABLE borrower_attribute_types_branches( -- association table between bor
 CREATE TABLE IF NOT EXISTS `borrower_modifications` (
   `timestamp` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
   `verification_token` varchar(255) NOT NULL DEFAULT '',
-  `changed_fields` MEDIUMTEXT NOT NULL,
+  `changed_fields` MEDIUMTEXT DEFAULT NULL,
   `borrowernumber` int(11) NOT NULL DEFAULT '0',
   `cardnumber` varchar(32) DEFAULT NULL,
   `surname` LONGTEXT,