diff --git a/Gemfile b/Gemfile
index e934b425..b74ac8cd 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,3 +4,4 @@ gem 'jekyll'
 gem 'jekyll-paginate'
 gem 'builder'
 gem 'rubysl-rexml'
+gem 'wdm', '>= 0.1.0' if Gem.win_platform?