diff --git a/whenever.gemspec b/whenever.gemspec
index 4bacee9..6307433 100644
--- a/whenever.gemspec
+++ b/whenever.gemspec
@@ -22,4 +22,10 @@ Gem::Specification.new do |s|
   s.add_development_dependency "shoulda", ">= 2.1.1"
   s.add_development_dependency "mocha", ">= 0.9.5"
   s.add_development_dependency "rake"
+  
+  # I'm not sure why this isn't installed along with activesupport,
+  # but for whatever reason running `bundle install` doesn't install
+  # i18n so I'm adding it here for now.
+  # https://github.com/rails/rails/blob/master/activesupport/activesupport.gemspec#L19 ?
+  s.add_development_dependency "i18"
 end