BOSTON (AP) — Jeremy Swayman stopped 21 shots in his first game since signing a new contract, and Mark Kastelic scored two goals Thursday night as the Boston Bruins scored four straight to overcome an early deficit and beat the Montreal Canadiens 6 to beat. -4.

Elias Lindholm and Cole Koepke each had a goal and two assists for Boston, which lost 6-4 to the Florida Panthers in its season opener on Tuesday night. Charlie McAvoy and David Pastrnak also scored to help the Bruins open a 5-2 lead.

Brendan Gallagher scored twice for Montreal, the second with four minutes remaining to make it a one-goal game. Kaiden Guhle had a goal and an assist and Cayden Primeau made 23 saves for the Canadiens, who defeated Toronto 1-0 in Montreal on Wednesday night.

Canadiens: Montreal started the season playing on back-to-back nights and didn’t have the energy to keep up with Boston.

Bruins: After losing their opener in Florida with Joonas Korpisalo in net, a game in which they trailed 5-1 in the second period, Boston seemed more comfortable with Swayman. The goaltender remained unsigned this summer and missed all of training camp before agreeing to an eight-year, $66 million contract on Sunday.

Montreal scored twice in the third period to close the three-goal deficit to 5-4 on Gallagher’s goal with four minutes remaining. But Kastelic scored his second of the match just 17 seconds later.

The Bruins outscored Montreal 23-11 in the first two periods, but the Canadiens held a 14-6 lead in the third.

Montreal returns home to take on Ottawa on Saturday. The Bruins host the Los Angeles Kings on Saturday for a three-game homestand.