^ Just what I wanted to say. Fold the strap in half a foot away from the buckle thingie and stuff the folded bit through the buckle. Voila!

In other news, mine (bagaboo) kept slipping, so I made a permanent 5" loop by fixing the strap to the buckle. Sooo nice to always have something largish to grab. I'm skinny enough that I wouldn't need the full length anyway.