diff --git a/omniauth-facebook.gemspec b/omniauth-facebook.gemspec
index 7219343..31c7c1d 100644
--- a/omniauth-facebook.gemspec
+++ b/omniauth-facebook.gemspec
@@ -17,4 +17,5 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency 'omniauth-oauth2', '~> 1.0.0.pr2'
 
   s.add_development_dependency 'rspec', '~> 2.6.0'
+  s.add_development_dependency 'rake'
 end