However, if I may ask, how big of a problem is that? It seems your website has the SEO done properly. So when I did a site: search for your domain using a mobile profile, it returned results with the m. prefix, while the same site: search on a desktop profile returns the naked domain. So I’d guess most people would enter your website the right way.
Now of course people may come through social network sharing. What you could do is work on your website so that it always share the desktop version, even if the visitor is on a mobile device. This way, other mobile users will be properly redirected, and non-mobile users would get the right stuff.