United's no.7 netted his 14th Old Trafford strike of 2021/22 in Monday night's comprehensive 3-0 win over Brentford.
Ronaldo was brought down in the box by Rico Henry during the second half and was awarded a penalty which he got up to dispatch confidently, sending the goalkeeper the wrong way.
It capped off a Man-of-the-Match performance by the 37-year-old whose relentless hard work off the ball and flair on it saw him record another impressive showing across the 90 minutes.
Ronaldo has now scored 18 goals in the Premier League this season, the same tally he hit during his last campaign in the competition, back in 2008/09.