diff --git a/app/helpers/dmsf_folder_permissions_helper.rb b/app/helpers/dmsf_folder_permissions_helper.rb
index 4c68766e..3ff2a3ba 100644
--- a/app/helpers/dmsf_folder_permissions_helper.rb
+++ b/app/helpers/dmsf_folder_permissions_helper.rb
@@ -22,13 +22,13 @@
 # Folders permissions helper
 module DmsfFolderPermissionsHelper
   def users_checkboxes(users, inherited: false)
-    s = +''
+    s = []
     id = inherited ? 'inherited_permissions[user_ids][]' : 'permissions[user_ids][]'
     users.each do |user|
       content = check_box_tag(id, user.id, true, disabled: inherited, id: nil) + user.name
       s << content_tag(:label, content, id: "user_permission_ids_#{user.id}", class: 'inline')
     end
-    s
+    safe_join s
   end
 
   def render_principals_for_new_folder_permissions(users)