diff --git a/db/migrate/20180528141303_fix_accounts_unique_index.rb b/db/migrate/20180528141303_fix_accounts_unique_index.rb
index 96cee37f9cb..624ea229e4f 100644
--- a/db/migrate/20180528141303_fix_accounts_unique_index.rb
+++ b/db/migrate/20180528141303_fix_accounts_unique_index.rb
@@ -1,4 +1,13 @@
 class FixAccountsUniqueIndex < ActiveRecord::Migration[5.2]
+  class Account < ApplicationRecord
+    # Dummy class, to make migration possible across version changes
+    has_one :user, inverse_of: :account
+
+    def local?
+      domain.nil?
+    end
+  end
+
   disable_ddl_transaction!
 
   def up