+1
I would dampen the glue joint, undo the headstock, let dry, clean, reglue, clamp and wait at least 48 hrs before attempting any work.
If you don't want to undo the headstock, use this glue (http://www.leevalley.com/wood/page.aspx?c=1&p=30261&cat=1,110) . Better than CA/Epoxy this this kind of repair and holds up extremely well.