diff --git a/Library/Homebrew/cmd/audit.rb b/Library/Homebrew/cmd/audit.rb
index 898cc43fbd..e4e20d5fda 100644
--- a/Library/Homebrew/cmd/audit.rb
+++ b/Library/Homebrew/cmd/audit.rb
@@ -5,6 +5,7 @@ require "formula_cellar_checks"
 require "official_taps"
 require "tap_migrations"
 require "cmd/search"
+require "date"
 
 module Homebrew
   def audit