diff --git a/test/unit/lib/redmine/hook_test.rb b/test/unit/lib/redmine/hook_test.rb
index 27e4e2e98..14782683a 100644
--- a/test/unit/lib/redmine/hook_test.rb
+++ b/test/unit/lib/redmine/hook_test.rb
@@ -166,7 +166,7 @@ class Redmine::Hook::ManagerTest < ActiveSupport::TestCase
   end
 
   def view_hook_helper
-    @view_hook_helper ||= TestHookHelperView.new(RAILS_ROOT + '/app/views')
+    @view_hook_helper ||= TestHookHelperView.new(Rails.root.to_s + '/app/views')
   end
 end