A hunter took aim at a moose, but missed and accidentally hit a man sitting on the toilet in a nearby cabin, according to police.
The bullet whizzed past the animal, pierced the wooden wall behind it and struck the man in the stomach.
The victim, who is in his seventies, was flown by helicopter to hospital but his injury was not life-threatening, said the policeman who led the investigation, Anders Stroemsaether.
The hunter was taken in for questioning in Hvaler district, about 74 miles south-east of the capital, Oslo.
The moose escaped unscathed.