Boro went ahead in the first ten minutes with a goal by Jason Kennedy but United equalised just before the break.
Boro then left it to stoppage time to seal victory with Tom Craddock scoring the decisive goal, much to the relief of his team mates.
Boro Team:
Knight, McMahon, Masters, Bates, Wheater, Cattermole, Liddle, Taylor (Johnson 89), Craddock, Morrison, Kennedy