diff --git a/Casks/u/ubar.rb b/Casks/u/ubar.rb
index cc9d9e8c04..0bec91b600 100644
--- a/Casks/u/ubar.rb
+++ b/Casks/u/ubar.rb
@@ -12,6 +12,8 @@ cask "ubar" do
     strategy :sparkle
   end
 
+  depends_on macos: ">= :high_sierra"
+
   app "uBar.app"
 
   zap trash: [