The error involved a PwC accountant handing presenter Warren Beatty the wrong envelope, which saw La La Land announced as best picture instead of rightful winner Moonlight.
PwC apologized in the aftermath of the incident and accepted full responsibility.
The firm has supervised the ballots for over 80 years, according to CNBC. PwC retained the responsibility after a presentation of “revised protocols and ambitious controls,” said Cheryl Boone Isaacs, the president of the Academy of Motion Picture Arts and Sciences.
Isaacs added that the Academy has been “unsparing” in their criticism of the firm.
PwC’s Brian Cullinan, who was thought to be tweeting around the time he handed over the wrong envelope, and his colleague Martha Ruiz will not return to work at the Oscars, The New York Times previously reported.