TC 30 problem with specifying ant home path

After upgrading to TC 3.0 we now have this problem:

TC creates directories like this:

C:\TeamCity\buildAgent\work\Server\95a53c374e579e31
It used to be
C:\TeamCity\buildAgent\work\Server\hoth

In our build config I need to specify an alternate ant builder because we have libs in our ant/lib directory:
e.g. Ant home path: C:/teamcity/buildAgent/work/Server/Hoth/hoth/dev

This doesn't work anymore because of the weird 95a53c374e579e31 name (which is different on every agent).

Any suggestions?