diff --git a/sprockets-vendor_gems.gemspec b/sprockets-vendor_gems.gemspec
index 26ab54e..655c21d 100644
--- a/sprockets-vendor_gems.gemspec
+++ b/sprockets-vendor_gems.gemspec
@@ -17,6 +17,7 @@ Gem::Specification.new do |gem|
 
   gem.add_dependency 'sprockets'
 
+  gem.add_development_dependency 'rake'
   gem.add_development_dependency 'rspec'
   gem.add_development_dependency 'mocha'
   gem.add_development_dependency 'fakefs'