The former Derby County man, now 25, agreed to meet up with Neil Warnock who is on holiday in Cornwall to put pen to paper.
Robert 'Kozzie' Kozluk
"Rob was on holiday in Cornwall so I went to see him and we concluded the deal in less than half-an-hour," Warnock, also on holiday in the south-west, told the club's official website.
"I'm sure our fans will be delighted to learn that Rob has signed for another two years.
"He proved that he's a valuable member of our squad by adapting to the left-back role late in the season."