The veteran center score twice in the second period after assisting on Marco Sturm's tally at 1:06 of the first.
Milan Lucic also scored once.
Ottawa's goals were scored by Nick Foligno in the first and Daniel Alfredsson (power play) in the second.
Netminder Martin Gerber allowed four goals on 27 shots for the Senators, who have lost two of three.
On the power play, Boston went 1-for-2, and Ottawa was 1-for-5.