diff --git a/app/controllers/admin/domains_controller.rb b/app/controllers/admin/domains_controller.rb
index 86af8e792..04b7bfbe3 100644
--- a/app/controllers/admin/domains_controller.rb
+++ b/app/controllers/admin/domains_controller.rb
@@ -1,5 +1,7 @@
 module Admin
   class DomainsController < BaseController
+    DEFAULT_VERSIONS_PER_PAGE = 10
+
     before_action :set_domain, only: %i[show edit update keep]
     authorize_resource
 
@@ -63,11 +65,10 @@ module Admin
     # rubocop:enable Metrics/MethodLength
 
     def versions
-      per_page = 10
       @domain = Domain.where(id: params[:domain_id]).includes({ versions: :item }).first
       @versions = @domain.versions
       @last_version = @versions.last
-      @old_versions = Kaminari.paginate_array(@versions.not_creates.reverse).page(params[:page]).per(per_page)
+      @old_versions = Kaminari.paginate_array(@versions.not_creates.reverse).page(params[:page]).per(DEFAULT_VERSIONS_PER_PAGE)
     end
 
     def keep