diff --git a/installer/data/mysql/atomicupdate/bug_25159.pl b/installer/data/mysql/atomicupdate/bug_25159.pl
new file mode 100755
index 0000000000..a2c24e7407
--- /dev/null
+++ b/installer/data/mysql/atomicupdate/bug_25159.pl
@@ -0,0 +1,13 @@
+use Modern::Perl;
+
+return {
+    bug_number => "251159",
+    description => "Add action logs should be stored in JSON ( and as a diff of the change )",
+    up => sub {
+        my ($args) = @_;
+        my ($dbh, $out) = @$args{qw(dbh out)};
+
+        $dbh->do(q{ALTER TABLE action_logs ADD COLUMN diff LONGTEXT NULL DEFAULT NULL AFTER trace;});
+        say $out "Added column 'action_logs.diff'";
+    },
+};
diff --git a/installer/data/mysql/kohastructure.sql b/installer/data/mysql/kohastructure.sql
index 809400d678..9dd93ecdd3 100644
--- a/installer/data/mysql/kohastructure.sql
+++ b/installer/data/mysql/kohastructure.sql
@@ -173,6 +173,7 @@ CREATE TABLE `action_logs` (
   `interface` varchar(30) DEFAULT NULL COMMENT 'the context this action was taken in',
   `script` varchar(255) DEFAULT NULL COMMENT 'the name of the cron script that caused this change',
   `trace` text DEFAULT NULL COMMENT 'An optional stack trace enabled by ActionLogsTraceDepth',
+  `diff` LONGTEXT NULL DEFAULT NULL COMMENT 'Stores a diff of the changed object',
   PRIMARY KEY (`action_id`),
   KEY `timestamp_idx` (`timestamp`),
   KEY `user_idx` (`user`),