diff --git a/Library/Homebrew/extend/os/mac/development_tools.rb b/Library/Homebrew/extend/os/mac/development_tools.rb
index c7d8012da4..b80be4c814 100644
--- a/Library/Homebrew/extend/os/mac/development_tools.rb
+++ b/Library/Homebrew/extend/os/mac/development_tools.rb
@@ -22,7 +22,7 @@ class DevelopmentTools
       when "clang" then :clang
       else
         # guess :(
-        if Xcode.version >= "4.3"
+        if MacOS::Xcode.version >= "4.3"
           :clang
         else
           :gcc