diff --git a/Library/Homebrew/requirements.rb b/Library/Homebrew/requirements.rb
index 0a3c401cc4..fac31112f1 100644
--- a/Library/Homebrew/requirements.rb
+++ b/Library/Homebrew/requirements.rb
@@ -5,4 +5,5 @@ require "requirement"
 require "requirements/arch_requirement"
 require "requirements/codesign_requirement"
 require "requirements/linux_requirement"
+require "requirements/macos_requirement"
 require "requirements/xcode_requirement"