The 33-year-old will again be leading the club's attack.
"I want to stay at Inter and I hope to do so until June 2014," the former Genoa man, who scored 24 League goals last term, said.
"It's nice to hear that I'm untouchable. I've always said that it's magnificent here. My teammates, the club and the fans make me feel loved.
"I will never be able to repay the Interisti for the affection which I have been shown "