BVB take on Augsburg when they resume their league campaign on Saturday, and he wants his side to stop other teams believing that they can come to get a result at Signal Iduna Park.
"It's our own fault that other teams believe they can come here and get a result," he told Bundesliga.com. "For a long time in the first half of the season, we were bang on target. Our aim isn't to catch Bayern Munich, who have a game in hand, but instead to beat Augsburg.
"Our priority is to work on the problem zones from the first half of the season. We've got to cut out the mistakes and keep asking questions of Augsburg until they have no more answers."
Dortmund are fourth in the Bundesliga after the first 17 games.