diff --git a/lib/redmine_dmsf/webdav/dmsf_resource.rb b/lib/redmine_dmsf/webdav/dmsf_resource.rb
index 9e3dd59f..dff5caaf 100644
--- a/lib/redmine_dmsf/webdav/dmsf_resource.rb
+++ b/lib/redmine_dmsf/webdav/dmsf_resource.rb
@@ -679,7 +679,7 @@ module RedmineDmsf
         return nil unless entity.locked?
 
         if entity.dmsf_folder && entity.dmsf_folder.locked?
-          locks = entity.lock.reverse[0].dmsf_folder.locks(false) # longwinded way of getting base items locks
+          locks = entity.lock.reverse[0].folder.locks(false) # longwinded way of getting base items locks
         else
           locks = entity.lock(false)
         end