Using waterline's Redis instance not working

[LeoMartinDev]

I'm actually trying to use node_acl redisBackend using a waterline's db instance. It's not working, it throws me this error:

Unhandled rejection TypeError: this.redis.multi is not a function at Object.RedisBackend.begin (E:\**\node_modules\acl\lib\redis-backend.js:23:23)