diff --git a/Library/Homebrew/cask/download.rb b/Library/Homebrew/cask/download.rb
index e6cfd4f6ca..0182440b4e 100644
--- a/Library/Homebrew/cask/download.rb
+++ b/Library/Homebrew/cask/download.rb
@@ -114,5 +114,3 @@ module Cask
     end
   end
 end
-
-require "extend/os/cask/download"
diff --git a/Library/Homebrew/extend/os/cask/download.rb b/Library/Homebrew/extend/os/cask/download.rb
deleted file mode 100644
index 180793b696..0000000000
--- a/Library/Homebrew/extend/os/cask/download.rb
+++ /dev/null
@@ -1,4 +0,0 @@
-# typed: true
-# frozen_string_literal: true
-
-require "extend/os/linux/cask/download" if OS.linux?
diff --git a/Library/Homebrew/extend/os/linux/cask/download.rb b/Library/Homebrew/extend/os/linux/cask/download.rb
deleted file mode 100644
index 6d453ff7e3..0000000000
--- a/Library/Homebrew/extend/os/linux/cask/download.rb
+++ /dev/null
@@ -1,13 +0,0 @@
-# typed: true
-# frozen_string_literal: true
-
-module Cask
-  class Download
-    undef quarantine
-
-    def quarantine(_path)
-      opoo "Cannot quarantine download: No xattr available on linux." if @quarantine
-      nil
-    end
-  end
-end