diff --git a/Rakefile b/Rakefile
index 3f05d37..52f4cb4 100644
--- a/Rakefile
+++ b/Rakefile
@@ -29,3 +29,9 @@ task :changelog, [:token] do |_t, args|
 
   sh cmd
 end
+
+require 'rake/extensiontask'
+
+Rake::ExtensionTask.new 'tox' do |ext|
+  ext.lib_dir = 'lib/tox'
+end