Cristiano Ronaldo's penalty earned Manchester United a narrow victory over Norwich to maintain Ralf Rangnick's unbeaten start as interim manager.
Ronaldo sent Tim Krul the wrong way on 75 minutes after the Portuguese had been hauled down by Max Aarons on the edge of the six-yard box.
The Red Devils had offered little attacking threat before then, though Alex Telles hit the bar with a deflected free-kick during the first half.
They also had David de Gea to thank for two fine stops to deny Teemu Pukki and Ozan Kabak as Norwich put in a spirited display.