United manager Danny Wilson named Chris Porter as a substitute after recent injury.
New midfield arrival Kevin McDonald missed out after he hurt his ankle against Walsall in the midweek 3-2 win, Lee Williamson coming into the starting XI.
United took the lead a minute brefore the break, Nick Montgomery on target with a long-range strike for the Blades.
Rovers equalised via substitute Joss Labadie with 10 minutes remaining.
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