diff --git a/Library/Homebrew/cask/lib/hbc/utils.rb b/Library/Homebrew/cask/lib/hbc/utils.rb
index 0f44c0157f..01ab4dad7f 100644
--- a/Library/Homebrew/cask/lib/hbc/utils.rb
+++ b/Library/Homebrew/cask/lib/hbc/utils.rb
@@ -4,17 +4,6 @@ require "stringio"
 
 BUG_REPORTS_URL = "https://github.com/caskroom/homebrew-cask#reporting-bugs".freeze
 
-class Buffer < StringIO
-  extend Predicable
-
-  attr_predicate :tty?
-
-  def initialize(tty = false)
-    super()
-    @tty = tty
-  end
-end
-
 # global methods
 
 def odebug(title, *sput)