diff --git a/Library/ENV/4.3/cc b/Library/ENV/4.3/cc
index 92b09a48c6..59a52b02dd 100755
--- a/Library/ENV/4.3/cc
+++ b/Library/ENV/4.3/cc
@@ -189,7 +189,7 @@ class Cmd
   end
   def archflags
     args = []
-    ENV['HOMEBREW_ARCHS'].split(',').each { |a| args << "-arch" << a } if cccfg? 'u'
+    args.concat ENV['HOMEBREW_ARCHFLAGS'].split(' ') if cccfg? 'u'
     args
   end
   def syslibpath
diff --git a/Library/Homebrew/extend/ENV/super.rb b/Library/Homebrew/extend/ENV/super.rb
index 9df429f32f..1fb0b3abf2 100644
--- a/Library/Homebrew/extend/ENV/super.rb
+++ b/Library/Homebrew/extend/ENV/super.rb
@@ -257,7 +257,7 @@ module Superenv
   end
 
   def universal_binary
-    self['HOMEBREW_ARCHS'] = Hardware::CPU.universal_archs.join(',')
+    self['HOMEBREW_ARCHFLAGS'] = Hardware::CPU.universal_archs.as_arch_flags
     append 'HOMEBREW_CCCFG', "u", ''
   end