diff --git a/tasks/boxes.rake b/tasks/boxes.rake
index a93f670..143017e 100644
--- a/tasks/boxes.rake
+++ b/tasks/boxes.rake
@@ -1,13 +1,15 @@
 namespace :boxes do
-  namespace :build do
+  namespace :quantal64 do
     desc 'Build Ubuntu Quantal 64 bits Vagrant LXC box'
-    task 'quantal64' do
-      unless File.exists?('./boxes/quantal64/rootfs-amd64')
-        sh 'cd boxes/quantal64 && ./download-ubuntu'
+    task :build do
+      if File.exists?('./boxes/output/lxc-quantal64.box')
+        puts 'Box has been built already!'
+        exit 1
       end
 
       sh 'mkdir -p boxes/output'
-      sh 'sudo rm -f output/lxc-quantal64.box boxes/quantal64/rootfs.tar.gz'
+      sh 'cd boxes/quantal64 && sudo ./download-ubuntu'
+      sh 'rm -f boxes/quantal64/rootfs.tar.gz'
       sh 'cd boxes/quantal64 && sudo tar --numeric-owner -czf rootfs.tar.gz ./rootfs-amd64/*'
       sh "cd boxes/quantal64 && sudo chown #{ENV['USER']}:#{ENV['USER']} rootfs.tar.gz && tar -czf ../output/lxc-quantal64.box ./* --exclude=rootfs-amd64 --exclude=download-ubuntu"
     end