diff --git a/.rubocop.yml b/.rubocop.yml
index 7efa2c6..1d6ed88 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -67,6 +67,12 @@ Style/OptionHash:
   Exclude:
     - lib/redmine_messenger/patches/*.rb
 
+# postgresql and mysql are supported
+# autodetect does not work without database configuration
+Rails/BulkChangeTable:
+  Enabled: true
+  Database: postgresql
+
 Style/ReturnNil:
   Enabled: true
 
diff --git a/db/migrate/003_add_private_settings.rb b/db/migrate/003_add_private_settings.rb
index b24eeee..288898b 100644
--- a/db/migrate/003_add_private_settings.rb
+++ b/db/migrate/003_add_private_settings.rb
@@ -2,7 +2,9 @@
 
 class AddPrivateSettings < ActiveRecord::Migration[4.2]
   def change
-    add_column :messenger_settings, :post_private_contacts, :integer, default: 0, null: false
-    add_column :messenger_settings, :post_private_db, :integer, default: 0, null: false
+    change_table :messenger_settings, bulk: true do |t|
+      t.integer :post_private_contacts, default: 0, null: false
+      t.integer :post_private_db, default: 0, null: false
+    end
   end
 end