diff --git a/Rakefile b/Rakefile
index bb6008e..a87500b 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,5 +1,5 @@
 task :default do
-  Dir['test/*_test.rb'].each { |file| require file }
+  Dir['test/**/*_test.rb'].each { |file| require file }
 end
 
 begin