diff --git a/sprockets.gemspec b/sprockets.gemspec
index b37029d9a..3e9a10afa 100644
--- a/sprockets.gemspec
+++ b/sprockets.gemspec
@@ -28,6 +28,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency "sass", "~> 3.1"
   s.add_development_dependency "uglifier"
   s.add_development_dependency "yui-compressor"
+  s.add_development_dependency "test-unit", "~>3.1"
 
   s.authors = ["Sam Stephenson", "Joshua Peek"]
   s.email = ["sstephenson@gmail.com", "josh@joshpeek.com"]