diff --git a/Library/Homebrew/dev-cmd/unbottled.rb b/Library/Homebrew/dev-cmd/unbottled.rb
index 5c866198a6..118e68cd0f 100644
--- a/Library/Homebrew/dev-cmd/unbottled.rb
+++ b/Library/Homebrew/dev-cmd/unbottled.rb
@@ -4,6 +4,7 @@
 require "cli/parser"
 require "formula"
 require "api"
+require "os/mac/xcode"
 
 module Homebrew
   extend T::Sig