diff --git a/react-rails.gemspec b/react-rails.gemspec
index 6c86d84ab..64d84c619 100644
--- a/react-rails.gemspec
+++ b/react-rails.gemspec
@@ -21,6 +21,7 @@ Gem::Specification.new do |s|
   s.add_dependency 'execjs'
   s.add_dependency 'rails', '>= 3.1'
   s.add_dependency 'react-source', '0.13.0'
+  s.add_dependency 'tilt'
 
   s.files = Dir[
     'lib/**/*',