diff --git a/Library/Homebrew/env.rb b/Library/Homebrew/env.rb
index a9cb6aa915..3d948275e8 100644
--- a/Library/Homebrew/env.rb
+++ b/Library/Homebrew/env.rb
@@ -21,5 +21,5 @@ require 'utils'
 # TODO if whoami == root then use /Library/Caches/Homebrew instead
 HOMEBREW_VERSION='0.3'
 HOMEBREW_CACHE=File.expand_path "~/Library/Caches/Homebrew"
-HOMEBREW_PREFIX=Pathname.new(__FILE__).dirname.parent.parent.realpath
+HOMEBREW_PREFIX=Pathname.new(__FILE__).dirname.parent.parent.cleanpath
 HOMEBREW_CELLAR=HOMEBREW_PREFIX+'Cellar'