diff --git a/Library/Homebrew/dev-cmd/audit.rb b/Library/Homebrew/dev-cmd/audit.rb
index 7ccc31a39b..b7e1bfb433 100644
--- a/Library/Homebrew/dev-cmd/audit.rb
+++ b/Library/Homebrew/dev-cmd/audit.rb
@@ -204,6 +204,7 @@ module Homebrew
     cask_results = if audit_casks.empty?
       {}
     else
+      require "cask/cmd/abstract_command"
       require "cask/cmd/audit"
 
       Cask::Cmd::Audit.audit_casks(