Canada's world junior team received an early wakeup call.
Miro Aaltonen scored 7:16 into the third period as Finland edged Canada 3-2 in an exhibition tuneup.
Markus Granlund and Ville Jarvelainen each scored on 5-on-3 power plays for the Finns.
Griffin Reinhart and Mark Scheifele replied for Canada with goals 36 seconds apart in the second period.
Canada will face Sweden in another exhibition game on Saturday before travelling to Ufa, Russia for the tournament.
It plays its first game there on Dec. 26 against Germany.