diff --git a/test/unit/helpers/application_helper_test.rb b/test/unit/helpers/application_helper_test.rb
index ab52017ff..dedf9900a 100644
--- a/test/unit/helpers/application_helper_test.rb
+++ b/test/unit/helpers/application_helper_test.rb
@@ -20,6 +20,7 @@
 require File.expand_path('../../../test_helper', __FILE__)
 
 class ApplicationHelperTest < ActionView::TestCase
+  include Redmine::I18n
   include ERB::Util
   include Rails.application.routes.url_helpers