Wheezy repository seems to be empty


I just tried to install docker-engine on a debian wheezy system, but the repository seems to be empty. I tried to add the repository manually and to use the script from get.docker.com but the result is always the same:

Unable to locate package docker-engine

If I grep the packages of the repo, it seems to empty:

grep ^Package: /var/lib/apt/lists/apt.dockerproject.org_repo_dists_debian-wheezy_*_Packages

Does anybody know what’s going on?