diff --git a/Library/Homebrew/extend/ARGV.rb b/Library/Homebrew/extend/ARGV.rb
index 24231292d7..e87048c0fb 100644
--- a/Library/Homebrew/extend/ARGV.rb
+++ b/Library/Homebrew/extend/ARGV.rb
@@ -51,6 +51,9 @@ module HomebrewArgvExtension
   def interactive?
     flag? '--interactive'
   end
+  def build_head?
+    flag? '--HEAD'
+  end
 
   def flag? flag
     options.each do |arg|