diff --git a/Casks/bestres.rb b/Casks/bestres.rb
index 91646cb0efa..8ae156c4465 100644
--- a/Casks/bestres.rb
+++ b/Casks/bestres.rb
@@ -8,5 +8,7 @@ cask :v1 => 'bestres' do
   homepage 'http://icyberon.com/bestres/'
   license :gratis
 
+  depends_on :macos => '>= :yosemite'
+
   app 'BestRes.app'
 end