The Bees are still third in League One despite slipping to a 2-0 defeat at MK Dons on Monday, and they have games in hand on leaders Doncaster and Bournemouth in second.
Four of their six remaining games are away from home, however, and Rosler knows they need to raise their game on the road.
"We have to play better away from home," he said.
"Teams sometimes give us the initiative and we are being a bit naove."
Rosler's strikers face some extra shooting practice following Monday's setback.
"They had two shots from outside the box and scored, we had a number of shots and didn't really look like scoring from outside the box," he added.
"We might need to do some shooting sessions."