diff --git a/Library/Homebrew/completions.rb b/Library/Homebrew/completions.rb
index 4f8b70887542e..fd5ab61e1f96b 100644
--- a/Library/Homebrew/completions.rb
+++ b/Library/Homebrew/completions.rb
@@ -4,6 +4,7 @@
 require "utils/link"
 require "settings"
 require "erb"
+require "tap"
 
 module Homebrew
   # Helper functions for generating shell completions.