Boss Micky Adams told his Port Vale players to brush up on their defending after their 1-1 derby draw against Burton.
Adams was delighted to make it three games unbeaten at the start of his second stint in charge, but he was less than happy with Aaron Webster's goal which gave Burton the lead in the 23rd minute.
Adams said: "I thought we created enough chances in the second half to win the game but it was also one we could have lost. It was one of those games that could have gone either way.
"I'm happy we're still unbeaten but I'm really disappointed to lose a goal like we did at a set-piece. People are not doing their jobs properly and that is something we're going to have to work on. We're a big side and we shouldn't be conceding a goal to anyone at set-pieces."
Doug Loft netted Vale's equaliser from 20 yards by putting the gloss on a swift counter-attack, just seconds after a full-length save by goalkeeper Stuart Tomlinson kept them in the game.
Adams described the midfielder's performance as 'outstanding', and added: "Doug has fantastic pace and energy. He doesn't give the opposition time to rest and causes problems all the time when he comes from deep."