diff --git a/lib/tasks/doc.rake b/lib/tasks/doc.rake
index 7681337..e3cbbe6 100644
--- a/lib/tasks/doc.rake
+++ b/lib/tasks/doc.rake
@@ -41,6 +41,8 @@ namespace :noosfero do
     toc_sections.each do |toc|
       section_topics = Dir.glob(File.dirname(toc) + '/*.textile').map {|item| item.sub('.textile', '.en.xhtml') }.reject {|item| ['index.en.xhtml', 'toc.en.xhtml' ].include?(File.basename(item))}
       file toc => section_topics do |t|
+        require 'app/models/doc_item'
+        require 'app/models/doc_topic'
         begin
           File.open(toc, 'w') do |output_file|
             section = File.basename(File.dirname(toc))
@@ -65,6 +67,8 @@ namespace :noosfero do
 
     top_level_toc = 'doc/noosfero/toc.en.xhtml'
     file top_level_toc => index_sections do
+      require 'app/models/doc_item'
+      require 'app/models/doc_topic'
       begin
         File.open(top_level_toc, 'w') do |output_file|
           output_file.puts "<!-- THIS FILE IS AUTOGENERATED. DO NOT EDIT -->"
@@ -88,6 +92,7 @@ namespace :noosfero do
 
     po4a_conf = 'tmp/po4a.conf'
     file po4a_conf => english_xhtml do
+      require 'noosfero'
       begin
         File.open(po4a_conf, 'w') do |file|
           file.puts "[po4a_langs] #{(Noosfero.locales.keys - ['en']).join(' ')}"
@@ -133,6 +138,7 @@ namespace :noosfero do
     desc "Translates Noosfero online documentation (does not touch PO files)"
     task :translate => [:link_plugins_textiles, :do_translation]
     task :do_translation => english_xhtml do
+      require 'noosfero'
       languages = Noosfero.locales.keys - ['en']
       languages.each do |lang|
         po = "po/#{lang}/noosfero-doc.po"
--
libgit2 0.21.2