The Academy of Motion Picture Arts and Sciences announced Saturday that it has revoked the Oscar nomination for one of the sound mixers on "13 Hours: The Secret Soldiers of Benghazi" for violating campaigning rules, one day before the Academy Awards ceremony.

The academy said in a statement that Greg P. Russell called fellow sound mixers during the nominations phase to "make them aware of his work on the film, in direct violation of a campaign regulation that prohibits telephone lobbying."

"The Board of Governors' decision to rescind Mr. Russell's nomination was made after careful consideration," said Cheryl Boone Isaacs, the president of the academy. "The Academy takes very seriously the Oscars voting process and anything – no matter how well-intentioned – that may undermine the integrity of that process."

Russell's revocation does not affect the three remaining sound mixing nominees for "13 Hours."

"13 Hours" is based on a book about the security team that fought to defend the U.S. diplomatic outpost during the 2012 terror attack in Benghazi that left four Americans dead.