Auto focus not working on Galaxy Nexus

I seem to have lost the auto focus capability on my Nexus. The phone is stock, only one update done (so it's XWKL2). I don't use the camera much, but I think I had auto focus when I first started using the phone. Now I have to manually focus by tapping the screen. I'd rather not clutter my phone with 3rd party apps for camera since I don't use it much, but I'd like to have AF for my random quick snaps. Any tips?