The Ducks announced the deal Wednesday with Fistric, who has become a regular on the blue line in his first season with the overall NHL leaders.
Fistric has five points and a plus-8 rating in 27 games with the Ducks, who signed him as a free agent in August. The hard-hitting defenceman is second on the Ducks with 123 hits despite playing in only about half of their games this season.
The former first-round pick didn't crack Anaheim's lineup until mid-November when defenceman Luca Sbisa injured his right hand.
Fistric also has played for Dallas and Edmonton during his NHL career. He scored six points for the Oilers last season.