diff --git a/Library/Homebrew/os/mac.rb b/Library/Homebrew/os/mac.rb
index 067244c5fc..c42e797277 100644
--- a/Library/Homebrew/os/mac.rb
+++ b/Library/Homebrew/os/mac.rb
@@ -104,6 +104,7 @@ module OS
 
     def default_compiler
       case default_cc
+        when /^gcc-4.0/ then :gcc_4_0
         when /^gcc/ then :gcc
         when /^llvm/ then :llvm
         when "clang" then :clang