Drop Link

Im about to change my drivers side drop link tomorrow, but have noticed that there doesnt seem to be a flat edge to it to allow me to get a spanner on to stop the thread from spinning, and nor does it have a whole to put an allen key in it.
so whats the best way to undo the nut???
 
Surely it's got one or the other? Are they original? I think mine had a torxs head.

If all else fails just cut it off!