diff --git a/Library/Homebrew/cask/cmd/install.rb b/Library/Homebrew/cask/cmd/install.rb
index 9d150e74af..961662f7a7 100644
--- a/Library/Homebrew/cask/cmd/install.rb
+++ b/Library/Homebrew/cask/cmd/install.rb
@@ -69,8 +69,6 @@ module Cask
         zap: nil,
         dry_run: nil
       )
-        # TODO: Refactor and move to extend/os
-        odie "Installing casks is supported only on macOS" unless OS.mac? # rubocop:disable Homebrew/MoveToExtendOS
 
         options = {
           verbose:        verbose,