diff --git a/Library/Homebrew/cask/lib/hbc/container.rb b/Library/Homebrew/cask/lib/hbc/container.rb
index cce04afd81..e42e02f7fc 100644
--- a/Library/Homebrew/cask/lib/hbc/container.rb
+++ b/Library/Homebrew/cask/lib/hbc/container.rb
@@ -4,7 +4,6 @@ require "hbc/container/base"
 require "hbc/container/air"
 require "hbc/container/bzip2"
 require "hbc/container/cab"
-require "hbc/container/criteria"
 require "hbc/container/dmg"
 require "hbc/container/self_extracting_executable"
 require "hbc/container/executable"
diff --git a/Library/Homebrew/cask/lib/hbc/container/criteria.rb b/Library/Homebrew/cask/lib/hbc/container/criteria.rb
deleted file mode 100644
index 79e58a1f1a..0000000000
--- a/Library/Homebrew/cask/lib/hbc/container/criteria.rb
+++ /dev/null
@@ -1,24 +0,0 @@
-module Hbc
-  class Container
-    class Criteria
-      attr_reader :path, :command
-
-      def initialize(path, command)
-        @path = path
-        @command = command
-      end
-
-      def extension(regex)
-        path.extname.sub(/^\./, "") =~ Regexp.new(regex.source, regex.options | Regexp::IGNORECASE)
-      end
-
-      def magic_number(regex)
-        return false if path.directory?
-
-        # 262: length of the longest regex (currently: Hbc::Container::Tar)
-        @magic_number ||= File.binread(path, 262)
-        @magic_number.match?(regex)
-      end
-    end
-  end
-end