"I am doing it until they change their mind," Baldwin, 51, said at the film Academy's Governors Awards over the weekend. "I do have some preparations, but it is a secret."
Besides, he says, he won't be up there alone. The Emmy-winning star of 30 Rock is co-hosting with Steve Martin, 64, who's done it twice.
"It is all on Steve," joked Baldwin. "Steve Martin has done this before, while for me it is the first time. All the pressure is on Steve Martin."
Baldwin was a surprise attendee at Friday's dinner, where honorary Oscars were handed out to such recipients as screen legend Lauren Bacall and B-movie king Roger Corman.
The 82nd Academy Awards will be broadcast Sunday, March 7, on ABC from the Kodak Theatre in Hollywood.