Nick Blackman's spot kick was enough to see the Blades dispose of ten-man Walsall at Bramall Lane on Tuesday night, much to the delight of boss Danny Wilson.
Wilson was relieved to see his team register a first home win in five matches against the Saddlers as United extended the unbeaten start in League One to 14 matches.
The Gaffer admitted afterwards it wasn't the best footballing spectacle or the most fluent performance after Dean Holden's early dismissal paved the way for the three points, but nevertheless he was content.
He said: "There are a few areas we would like to address but we got the win.
"We got the goal from a penalty, but the tempo of our game went after that and the lads perhaps thought we were going to coast to victory.
"But I said before the game that Walsall have got some very good young players who can play, so full credit to the way they applied themselves and stuck at it.
"We overplayed in certain areas and on other occasions we didn't attack balls into the box. In other instances we didn't move the ball quick enough but we grinded out the three points which is what everyone wanted."
The boss believes it wouldn't be beneficial to be too critical at the present time, although he knows standards must improve in the weeks ahead:
"George (Long) has made another great save in the game, but I am slightly disappointed that we didn't make more of all the possession we had.
"Despite that, I said before the game I would take a scrappy 1-0 to break the draw sequence at Bramall Lane.
"It may not be conducive to pick the negatives out when you are in the middle of an unbeaten run like this. We know we can do better as a group of players, but we have done at times this season and not won.
"You have to take the game and analyse the performance, but most importantly we have registered another win. When good teams don't play well and win it is a bonus."