Gostisbehere, 24, had seven goals and 39 points in 76 games this season, a drop-off from a sensational rookie season that saw Flyers fans chanting for "Ghost."
He had 17 goals and 46 points as rookie. He won the Barry Ashbee Trophy as the Flyers' best defenseman and finished second in voting for the Calder Trophy, given to the NHL's Rookie of the Year.
Gostisbehere scored four overtime goals over the course of the season, becoming the first NHL rookie to do so, and set Flyers and NHL records with a 15-game scoring streak from Jan. 19 to Feb. 20, 2016. Gostisbehere was also voted to the league's all-rookie team.
In 142 career NHL games, Gostisbehere has 24 goals and 61 assists for 85 points.