Blades boss Chris Wilder is targeting a clean sheet in Saturday's Sky Bet EFL League One encounter with Peterborough United at Bramall Lane.
Despite winning three games on the spin, scoring seven goals in the process in the victories over Oxford, Gillingham and most recently AFC Wimbledon, Wilder is now demanding a first shutout of the campaign against free scoring Posh.
Speaking ahead of the fixture against Grant McCann's side, he remarked: "We have to be keeping a few clean sheets if I'm honest. That's definitely something we need to do.
"We've not had Simon making save after save after save. We've not been sat under our own crossbar hacking balls off the line.
"So, not being able to keep the opposition scoreless has been a disappointment. It's a situation we need to address soon."
But despite the lack of clean sheets, the Blades boss is encouraged by home his defenders have adapted to a change of formation in the last two away matches.
Wilder added: "We thought the three central defenders might be the way we'd go long-term.
"The boys have taken to the system really quickly and worked hard on getting it right.
"There's still room for improvement though because you've got to remain balanced and focused.
"Nobody is promoted at Christmas if they're going great guns and the season isn't over either if you aren't quite where you want to be."