The actor is in the process of shooting the final 30 Rock episodes with co-stars Tina Fey, Tracy Morgan, Alec Baldwin and Jane Krakowski.
Speaking to The AP, McBrayer - who plays Kenneth the Page - admitted that he dreads filming 30 Rock's concluding instalment.
"Toward the end it's going to start getting emotional," he explained, adding more humorously: "I'm going to start stealing stuff right and left!"
McBrayer also expressed hopes that he will be allowed to keep Kenneth the Page's iconic blue suit.
"It's pretty much just formed to my own skin like body paint at this point," he quipped.
His fondness was recently echoed by co-star Alec Baldwin, who has predicted he will never enjoy a job as much as he loved 30 Rock.
"I think mostly people are very sad, because it's been a great experience and we'll never be able to duplicate this again. I'll also never have as good a job as this - ever," Baldwin commented in October.
30 Rock returns Thursday, November 15 at 8/7c on NBC.