Clayton Donaldson's 83rd minute goal earned Blues three away points against Steve Clarke's side on Wednesday night.
"Our away form has not been good since the turn of the New Year and we wanted to do something about that," the Blues boss said after the game.
"There was a lack of intensity in the match and it felt like and end-of-season game. We weren't as attacking as we'd have liked and we had to weather a bit of pressure from Reading. But they didn't have too many chances.
"We made some changes later in the game and it really opened up for us.
"We probably had more clear-cut chances in the last 15 minutes than we've had in the last five or six games.
"We should have gone on and scored a couple more goals."