For me the problem was that docker and docker-compose weren’t appropriately symlinked to the docker mac versions (see this bug that I just created: Docker and docker-compose didn’t symlink correctly). This fixed it for me:
rm /usr/local/bin/docker
rm /user/local/bin/docker-compose
ln -s /Applications/Docker.app/Contents/Resources/bin/docker /usr/local/bin/docker
ln -s /Applications/Docker.app/Contents/Resources/bin/docker-compose /usr/local/bin/docker-compose