Bristol City defender Joe Bryan has signed a new deal that will see him remain at the club until 2015.
The 19-year-old has agreed the extension after making a strong start to the 2012/13 campaign.
Manager Derek McInnes told the club's official website: "I'm delighted we've managed to secure another young talent to an extended deal.
"Joe has worked very hard and shown us enough talent to earn this contract and hopefully it gives him the stability to establish himself at first team level."
Bryan added: "As soon as the manager said he'd like to give me a new deal it was a very easy decision; I was delighted.
"I always felt if called upon I could do a job for the club and it's my ultimate aim to command a regular place."