Cloudflare and a domain without www

Hello,

We activate cloud flare for a server but we have a problem.

When cloudflare changes the DNS records for a domain add following record:

www CNAME www.domain.es.cdn.cloudflare.net.

But our domains works without www by default, so when yo access to domain.com instead of www.domain.com no cloudflare is working.

How can we fix this in the DNS records?

Thanks