diff --git a/Library/Homebrew/formulary.rb b/Library/Homebrew/formulary.rb
index b318dcf9d4..767b8b9536 100644
--- a/Library/Homebrew/formulary.rb
+++ b/Library/Homebrew/formulary.rb
@@ -5,6 +5,7 @@ require "digest/md5"
 require "extend/cachable"
 require "tab"
 require "utils/bottles"
+require "service"
 
 require "active_support/core_ext/hash/deep_transform_values"