diff --git a/lib/omnibus/project.rb b/lib/omnibus/project.rb
index <HASH>..<HASH> 100644
--- a/lib/omnibus/project.rb
+++ b/lib/omnibus/project.rb
@@ -147,7 +147,7 @@ module Omnibus
       if null?(val)
         @install_dir || raise(MissingRequiredAttribute.new(self, :install_dir, '/opt/chef'))
       else
-        @install_dir = File.expand_path(val, Config.project_root)
+        @install_dir = val
       end
     end
     expose :install_dir
Do not expand_path on Project#install_dir

Expanding the path on the install_dir causes crazy unwanted side-effects
in the test suite, since paths are expanded relative to PWD and running
the tests on Windows becomes evil.