The conference said "a miscommunication occurred between the officials and the table crew" that led to Duke retaining the possession arrow after earning possession from a jump ball with 16:58 left in the game.
The next tie-up came with 6:39 to go and Maryland leading 56-54. Instead of giving the ball to the Terrapins, the arrow allowed Duke to keep possession. The Blue Devils' Amile Jefferson scored on a layup from the ensuing inbound pass to tie the score.
Duke went on to win 69-67 after Maryland forward Charles Mitchell's shot in the final seconds fell off the rim.
"The matter has been and will be handled internally by the league office," the ACC said in a statement.
League spokeswoman Amy Akola told the Baltimore Sun that the conference would not be changing the outcome of the game because of the botched call.