But, Markus Hannikainen settled the score just 1:55 into the extra frame with the overtime winner, lifting the Finns to a 3-2 victory at AccorHotels Arena in Paris.
In addition to registering his first goal of the tournament, Martinsen also collected four shots on goal in the loss while logging 14:37 of ice time.
Norway's other marker came courtesy of Anders Bastiansen. Juuso Hietanen and Julius Honka, meanwhile, also lit the lamp for Finland.
Martinsen will be back in action on Monday when Norway takes on Canada. It will mark the second-to-last game of the preliminary round for both clubs.
