diff --git a/extra/sample_plugin/app/models/meeting.rb b/extra/sample_plugin/app/models/meeting.rb
index 62dcd8a..ca8af10 100644
--- a/extra/sample_plugin/app/models/meeting.rb
+++ b/extra/sample_plugin/app/models/meeting.rb
@@ -7,5 +7,6 @@ class Meeting < ActiveRecord::Base
                 :url => Proc.new {|o| {:controller => 'meetings', :action => 'show', :id => o.id}}
 
   acts_as_activity_provider :timestamp => 'scheduled_on',
-                            :scope => includes(:project)
+                            :scope => includes(:project),
+                            :permission => nil
 end