Second-half goals from Cameron Carter-Vickers and Callum McGregor earned Celtic another crucial three points against St Mirren.
Carter-Vickers lashed home from close range to ease the tension at Parkhead 10 minutes after the break after Celtic had struggled to cut through a well-drilled visiting team.
The opener did not open the floodgates by any means but Celtic's lead was never threatened before McGregor doubled it in the 81st minute when he drilled home from inside the box.
