Van der Merwe has made quite the impression since joining Ulster, becoming a key cog at the heart of their pack and even pitching in with two tries in 21 GUINNESS PRO12 appearances last term.
In addition to his line-out prowess, the South African - who won his only Springboks cap back in 2013 - has also captained the province on occasion and is adamant he had no hesitation in inking a new deal.
"I'm really pleased to sign on for another year with Ulster. I've thoroughly enjoyed my time here and it was an easy decision for me and my family to take," said Van der Merwe.
"We have felt very welcome from the moment we arrived and that is down to everyone involved in Ulster Rugby - the players, the management team and the supporters.
"This season has been a bit of a transition with Les (Kiss) coming in, but I'm really excited to be part of the squad's growth over the next 18 months.
"The challenge for us is to keep improving and pushing to achieve silverware, and I'm confident that we'll continue to develop our game under Les and the other coaches.
"I have tried to bring some of my experience to the group and help some of the younger players.
"It's been encouraging for me to see some young forwards come through and make their mark in Europe and in the PRO12, which augurs well for a successful Ulster team in the future."
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