diff --git a/init.rb b/init.rb
index 28c7759..c597ae1 100644
--- a/init.rb
+++ b/init.rb
@@ -31,7 +31,7 @@
            :partial => 'meeting_room_calendar/meeting_room_calendar_settings'
 end
 
-ActionDispatch::Callbacks.to_prepare do
+ActionDispatch::Callbacks.to_param do
   require_dependency 'project'
   Project.send(:include, RedmineMeetingRoomCalendar::Patches::ProjectPatch)
 end