diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index 0d33a30..4da867d 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -317,7 +317,7 @@ module ApplicationHelper
   def principals_check_box_tags(name, principals)
     s = ''
     principals.each do |principal|
-      s << "<label>#{ check_box_tag name, principal.id, false } #{h principal}</label>\n"
+      s << "<label>#{ check_box_tag name, principal.id, false, :id => nil } #{h principal}</label>\n"
     end
     s.html_safe
   end