While it appeared Olivier Giroud's deflected effort was heading into the net after fine recovery work from Paul Pogba, Mbappe made certain to put France on course for a second Group C win with a simple close-range finish.
And in doing so the teenage sensation set a new milestone for his nation at a major tournament.
At 19 years and six months, Mbappe is now the youngest player ever to score for France at a finals, including both World Cup and European Championship competition.
In setting the new record, he also overtakes two Les Bleus legends.
19 - Kylian Mbappe (19 years & 6 months) is the youngest France 🇫🇷 player ever to score in a major tournament 🏆 (World Cup + EURO). Speechless.— OptaJean (@OptaJean) 21 de junio de 2018
Thierry Henry and David Trezeguet were the previous holders of that distinction, achieved during the 1998 World Cup.
The pair both found the net at the age of 20 as the European team lifted the trophy for the first time in their history on home soil.
Mbappe, of course, does not remember that campaign, and is in fact the first player born after France 1998 to score at a World Cup.
Can the star teenager and his team-mates inspire France to a similar result in Russia?