diff --git a/slate/Gemfile b/slate/Gemfile
index f692e762..d63e2356 100644
--- a/slate/Gemfile
+++ b/slate/Gemfile
@@ -13,3 +13,5 @@ gem 'nokogiri', '~> 1.13.10'
 
 # Additional deps
 #gem 'therubyracer', '~> 0.12.3'
+
+gem 'wdm', '>= 0.1.0' if Gem.win_platform?