A rare loss for the Canadiens at home.
Ryan Spooner scored in overtime as Boston beat Montreal 2-1, dropping the Habs to 14-1-and-2 at Bell Centre.
Austin Czarnik scored for the Bruins in regulation time, and Tuukaa Rask made 30 saves for the win.
Paul Byron scored for Montreal.
Carey Price made 27 saves in the loss.