1 files changed, 1 insertions, 1 deletions
diff --git a/Gemfile b/Gemfile
index d4b7ce83f5..20e0b7792c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -12,7 +12,7 @@ group(:development, :test) do
   gem "simplecov"
   gem 'rack', "~> 1.5.1"
 
-  gem 'ruby-shadow', :platforms => :ruby unless RUBY_PLATFORM.downcase.match(/(darwin|freebsd|aix)/)
+  gem 'ruby-shadow', :platforms => :ruby unless RUBY_PLATFORM.downcase.match(/(darwin|freebsd|aix|cygwin)/)
 end
 
 # If you want to load debugging tools into the bundle exec sandbox,