diff --git a/Gemfile b/Gemfile
index 8452134b7..fcbcfca73 100644
--- a/Gemfile
+++ b/Gemfile
@@ -28,4 +28,4 @@ end
 gem "tzinfo-data", platforms: [:mingw, :mswin, :x64_mingw, :jruby]
 
 # Performance-booster for watching directories on Windows
-gem "wdm", "~> 0.1.0" if Gem.win_platform?
+gem "wdm", "~> 0.1", :platforms => [:mingw, :x64_mingw, :mswin]