diff --git a/rainbow.gemspec b/rainbow.gemspec
index 42db191..1d89862 100644
--- a/rainbow.gemspec
+++ b/rainbow.gemspec
@@ -19,6 +19,8 @@ Gem::Specification.new do |spec|
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ["lib"]
 
+  spec.add_dependency "rake"
+
   spec.add_development_dependency "bundler", "~> 1.3"
   spec.extensions    = ["ext/mkrf_conf.rb"]
 end