The National Council on Problem Gambling's commercial was lampooned around the world after Germany thrashed Brazil 7-1 in the semi-finals, sparking jokes that the ad would encourage rather than deter gambling.
The laughs got louder after Germany beat Argentina 1-0 early on Monday Singapore time, with many people taking to social media to congratulate Andy on his family's good fortune.
"Andy, okay you can stop smiling. Go get your savings from your daddy. Tell him please don't do this again and you get ready for school," Minister of State at the Trade and Industry Ministry Teo Ser Luck wrote on his Facebook page.
The council swiftly put up a new version of the ad on its website, making clear Andy's father was unlikely to be spending his winnings on a family holiday.
"Your dad's team won. Did you get your savings back?" asks Andy's friend.
"No, dad never stops... He wants to bet one more time," comes his reply, without specifying where he might put his next wager.
The council said last week it had chosen Germany in the ad to inject a sense of "realism" into its message and that the idea was to deter people from getting carried away by the World Cup hype.
Gambling is hugely popular in Singapore but tightly regulated, with soccer bets only allowed to be placed through state-owned bookmaker Singapore Pools.
The government launched the anti-gambling council in 2005 - before it allowed two multi-billion dollar gaming resorts to open in 2010.