diff --git a/Library/Homebrew/cask/lib/hbc/cask.rb b/Library/Homebrew/cask/lib/hbc/cask.rb
index a193a394e9..47f3b176ae 100644
--- a/Library/Homebrew/cask/lib/hbc/cask.rb
+++ b/Library/Homebrew/cask/lib/hbc/cask.rb
@@ -74,8 +74,6 @@ module Hbc
     end
 
     def dumpcask
-      return unless CLI.debug?
-
       odebug "Cask instance dumps in YAML:"
       odebug "Cask instance toplevel:", to_yaml
       [
diff --git a/Library/Homebrew/cask/lib/hbc/cli.rb b/Library/Homebrew/cask/lib/hbc/cli.rb
index 37784f4c3c..d0c4f30df8 100644
--- a/Library/Homebrew/cask/lib/hbc/cli.rb
+++ b/Library/Homebrew/cask/lib/hbc/cli.rb
@@ -71,7 +71,6 @@ module Hbc
 
     FLAGS = {
       ["--[no-]binaries", :binaries] => true,
-      ["--debug",         :debug]    => false,
       ["--verbose",       :verbose]  => false,
       ["--outdated",      :outdated] => false,
       ["--help",          :help]     => false,
@@ -158,7 +157,7 @@ module Hbc
       run_command(command, *rest)
     rescue CaskError, CaskSha256MismatchError, ArgumentError => e
       msg = e.message
-      msg << e.backtrace.join("\n") if debug?
+      msg << e.backtrace.join("\n") if ARGV.debug?
       onoe msg
       exit 1
     rescue StandardError, ScriptError, NoMemoryError => e
@@ -239,7 +238,6 @@ module Hbc
 
       # for compat with Homebrew, not certain if this is desirable
       self.verbose = true if ARGV.verbose?
-      self.debug = true if ARGV.debug?
 
       remaining
     end
diff --git a/Library/Homebrew/cask/lib/hbc/cli/internal_dump.rb b/Library/Homebrew/cask/lib/hbc/cli/internal_dump.rb
index 8017a32cf7..94dd309bdb 100644
--- a/Library/Homebrew/cask/lib/hbc/cli/internal_dump.rb
+++ b/Library/Homebrew/cask/lib/hbc/cli/internal_dump.rb
@@ -12,7 +12,6 @@ module Hbc
       end
 
       def self.dump_casks(*cask_tokens)
-        CLI.debug = true # Yuck. At the moment this is the only way to make dumps visible
         count = 0
         cask_tokens.each do |cask_token|
           begin
diff --git a/Library/Homebrew/cask/lib/hbc/system_command.rb b/Library/Homebrew/cask/lib/hbc/system_command.rb
index c14079bc8b..ac2a2346ec 100644
--- a/Library/Homebrew/cask/lib/hbc/system_command.rb
+++ b/Library/Homebrew/cask/lib/hbc/system_command.rb
@@ -154,7 +154,7 @@ module Hbc
       def self._parse_plist(command, output)
         raise CaskError, "Empty plist input" unless output =~ /\S/
         output.sub!(/\A(.*?)(<\?\s*xml)/m, '\2')
-        _warn_plist_garbage(command, Regexp.last_match[1]) if CLI.debug?
+        _warn_plist_garbage(command, Regexp.last_match[1]) if ARGV.debug?
         output.sub!(%r{(<\s*/\s*plist\s*>)(.*?)\Z}m, '\1')
         _warn_plist_garbage(command, Regexp.last_match[2])
         xml = Plist.parse_xml(output)
diff --git a/Library/Homebrew/cask/lib/hbc/utils.rb b/Library/Homebrew/cask/lib/hbc/utils.rb
index b2b65a08e0..4562fc4689 100644
--- a/Library/Homebrew/cask/lib/hbc/utils.rb
+++ b/Library/Homebrew/cask/lib/hbc/utils.rb
@@ -29,7 +29,7 @@ end
 # global methods
 
 def odebug(title, *sput)
-  return unless Hbc::CLI.debug?
+  return unless ARGV.debug?
   puts Formatter.headline(title, color: :magenta)
   puts sput unless sput.empty?
 end
diff --git a/Library/Homebrew/test/cask/cli/options_spec.rb b/Library/Homebrew/test/cask/cli/options_spec.rb
index 44a391b489..eb0bf1a49d 100644
--- a/Library/Homebrew/test/cask/cli/options_spec.rb
+++ b/Library/Homebrew/test/cask/cli/options_spec.rb
@@ -120,17 +120,6 @@ describe Hbc::CLI, :cask do
     end
   end
 
-  describe "--debug" do
-    it "sets the Cask debug method to true" do
-      begin
-        Hbc::CLI.process_options %w[help --debug]
-        expect(Hbc::CLI.debug?).to be true
-      ensure
-        Hbc::CLI.debug = false
-      end
-    end
-  end
-
   describe "--help" do
     it "sets the Cask help method to true" do
       begin