Manually set forum container for og

The details block on the group page shows a link to 'Group forums', but in my case, the wrong link.

I installed forum and made all containers I need. Later I decided to add OG and OG Forum. Now when I add a group, a container is automatically added: wonderfull! I rearranged all the subcontainers to my OG-containers so I wouldn't have to make all those subcontainers. Now the link in the group details block shows one of the subcontainers. I thought this micht be some setting, but I couldn't find this anywhere. I dug into the modules code and saw a function (og_forum_get_forum_container) that chooses the container on the lowest id available. Is this function responsible to choose which link to make? Might there be any idea to change this behavior?

Thanks!