Bruins goalie Malcolm Subban earned the win over his brother P.K., a Canadiens defenseman.
Malcolm Subban entered the game midway through the second period and stopped all 12 shots he faced. Boston outshot Montreal 40-20 overall.
Carey Price allowed three goals on 22 shots.
The Canadiens didn't get a shot on Chad Johnson until after the 12-minute mark, but they scored when they did. Francis Bouillon picked up Louis Lelanc's rebound and banked it in at 12:07.