Change default kernel in rEFInd?

So I recently switched over from GRUB to rEFInd on my new install. I'm using linux-zen kernel with linux-lts as backup in case of any problems. Problem is, rEFInd will by default boot the most recently updated kernel, even if the kernel release itself is actually older. So if LTS has just been updated, it will boot that instead of Zen. Is there any way to specify a default kernel in my refind.conf?

EDIT: For now I've fixed the problem by disabling kernel folding, making the kernels appear as two separate menu entries (with Zen being the default). But ideally, I would have just one entry and Zen as default kernel (looks a little bit cleaner and easier to switch to my Windows partition)