diff --git a/Rakefile b/Rakefile
index 45b7be94..8b609082 100644
--- a/Rakefile
+++ b/Rakefile
@@ -40,6 +40,7 @@ desc 'Clean Generated Files'
 task :clean do
   FileUtils.rm_r(BUILD_DIR, :force => true)
   FileUtils.mkdir(BUILD_DIR)
+  FileUtils.rm_r('test_out', :force => true)
 end