diff --git a/Library/Homebrew/formulary.rb b/Library/Homebrew/formulary.rb
index 0eefad1f52..d7b9f020ba 100644
--- a/Library/Homebrew/formulary.rb
+++ b/Library/Homebrew/formulary.rb
@@ -326,7 +326,7 @@ class Formulary
   end
 
   def self.core_path(name)
-    Pathname.new("#{HOMEBREW_LIBRARY}/Formula/#{name.downcase}.rb")
+    CoreFormulaRepository.instance.formula_dir/"#{name.downcase}.rb"
   end
 
   def self.tap_paths(name, taps = Dir["#{HOMEBREW_LIBRARY}/Taps/*/*/"])