I'm building a bass with a friend at the moment. He's done a bunch of stuff to it. Last week he spent some time doing the final shaping on the neck. I did some work on it today and discovered he's sanded a divot or notch into the neck surface just below the 14th fret on the bass side... You can just make it out in this pic...

The timber is gone. What I'm wondering is if there is a possible fix that isn't too dramatic?
Could I glue in some layers of veneer and try and build it up some how?
Other ideas/thoughts?