Configure Celery to talk to Redis via Unix socket

I would like Celery to build on Redis rather than the default RabbitMQ.

The Celery documentation explains:

Configuration is easy, just configure the location of your Redis database:

BROKER_URL = 'redis://localhost:6379/0'

Where the URL is in the format of:

redis://:password@hostname:port/db_number

all fields after the scheme are optional, and will default to localhost on port 6379, using database 0.

However, I have Redis set up NOT to listen to a port, but instead to listen to a socket.

Is there a URI scheme to support this?