Sam Gallagher scored a second-half winner to send Blackburn Rovers second in the Championship as they edged past Middlesbrough.
The 26-year-old took advantage of Paddy McNair's error to swivel and score his sixth goal of the season with a low shot to separate the sides.
Until that point, Boro were much the better side in the second half but a lengthy delay for a fan taken ill halted their momentum, and moments after the restart, Gallagher struck.
Matt Crooks had a golden chance to equalise towards the end of 12 minutes of stoppage time but headed a free-kick from the right over the bar from inside the six-yard box.