diff --git a/lib/dialoga_plugin/api.rb b/lib/dialoga_plugin/api.rb
index 006a684..cd286b9 100644
--- a/lib/dialoga_plugin/api.rb
+++ b/lib/dialoga_plugin/api.rb
@@ -5,7 +5,7 @@ class DialogaPlugin::API < Grape::API
           discussion = ProposalsDiscussionPlugin::Discussion.find(params[:discussion_id])
           
           # render articles using Entity Article
-          present discussion.random_topics_one_by_category, :with => Noosfero::API::Entities::Article, :fields => params[:fields]
+          present discussion.random_topics_one_by_category, :with => Api::Entities::Article, :fields => params[:fields]
       end
   end
 
--
libgit2 0.21.2