Heroku / Clojure PORT Error

2012-01-03T04:48:13+00:00 heroku[slugc]: Slug compilation started
2012-01-03T04:48:54+00:00 heroku[api]: Deploy 7065ef2 by <me>@gmail.com
2012-01-03T04:48:54+00:00 heroku[api]: Release v9 created by <me>@gmail.com
2012-01-03T04:48:55+00:00 heroku[web.1]: State changed from crashed to created
2012-01-03T04:48:55+00:00 heroku[web.1]: State changed from created to starting
2012-01-03T04:48:55+00:00 heroku[slugc]: Slug compilation finished
2012-01-03T04:49:05+00:00 heroku[web.1]: State changed from starting to crashed
2012-01-03T04:49:05+00:00 heroku[web.1]: State changed from crashed to created
2012-01-03T04:49:05+00:00 heroku[web.1]: State changed from created to starting
2012-01-03T04:49:09+00:00 heroku[web.1]: Starting process with command `lein run -m http.handler`
2012-01-03T04:49:13+00:00 app[web.1]: Listening for transport dt_socket at address: 32970
2012-01-03T04:49:14+00:00 heroku[web.1]: Stopping process with SIGKILL
2012-01-03T04:49:14+00:00 heroku[web.1]: Error R11 (Bad bind) -> Process bound to port 32970, should be 13527 (see environment variable PORT)
2012-01-03T04:49:15+00:00 heroku[web.1]: State changed from starting to crashed
2012-01-03T04:49:16+00:00 heroku[web.1]: Process exited
2012-01-03T04:49:17+00:00 heroku[router]: Error H10 (App crashed) -> GET <my-app>.herokuapp.com/ dyno= queue= wait= service= status=503 bytes=
2012-01-03T04:49:17+00:00 heroku[router]: Error H10 (App crashed) -> GET <my-app>.herokuapp.com/favicon.ico dyno= queue= wait= service= status=503 bytes=