diff --git a/Gemfile b/Gemfile
index c88697a51471..d39964ce833b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,4 +5,5 @@ group :development, :test do
   gem 'jekyll-redirect-from', '~> 0.14.0'
   gem 'jekyll-sitemap', '~> 1.2.0'
   gem 'jekyll-toc', '~> 0.9.0'
+  gem 'wdm', '~> 0.1.1', :install_if => Gem.win_platform?
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index 1194eaec4a63..bd2a8a412f6c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -65,6 +65,7 @@ GEM
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
+    wdm (0.1.1)
 
 PLATFORMS
   ruby
@@ -75,6 +76,7 @@ DEPENDENCIES
   jekyll-redirect-from (~> 0.14.0)
   jekyll-sitemap (~> 1.2.0)
   jekyll-toc (~> 0.9.0)
+  wdm (~> 0.1.1)
 
 BUNDLED WITH
    1.17.1