KARL Robinson vowed to fix Oxford United’s struggles at set-pieces after they came unstuck at AFC Wimbledon.

The U’s conceded from a corner and a free-kick as the hosts fought back from 1-0 down at half-time to win 3-1 at Plough Lane.

It came after United shipped three goals from set-pieces at Cambridge United in midweek, albeit with a much-changed side.

The visitors were also unable to worry Wimbledon goalkeeper Nik Tzanev from their 13 corners and Robinson revealed harsh words were spoken in the dressing room at full-time.

“It’s something we’ve spoken about this week and we’re being done in the same areas time and time again,” the U’s head coach said.

“The crux of the conversation was disappointment at the set-plays and of being vulnerable in certain aspects, naivety in some ways.

“We’ve dominated most parts of the football game, but we didn’t defend set-plays properly.

“We’ve had 13 or 14 that we didn’t get first contact on.

“That’s something we have to look at as a staff this week.”

He added: “I’m in charge of what goes on, so I accept responsibility.

“There’s certain aspects that they have to sit down and be better at.

“It’s a bitter pill to swallow tonight and something that will hurt, but it’s something that we’ve got to put right.”

Jack Rudoni headed a 55th-minute equaliser for the hosts following a free-kick, before Will Nightingale made it 2-1 from a corner 11 minutes from time.

Rudoni scored his second goal within seconds to put the game beyond United, who had gone ahead in first-half stoppage-time through Mark Sykes.

The midfielder was replaced by Sam Winnall with 15 minutes left, as the U’s switched to a 4-4-2 diamond.

Reflecting on the tactical change, Robinson said: “We felt that they were pressing us a little bit higher and we needed to get beyond that.

“We weren’t winning too many first-phase contacts with Matty and you still want to win the game.

“Sam also gives us a bigger body from set-plays.

“Sometimes things work, sometimes they don’t.”