This Mariah Carey fan’s “One Sweet Day” turned a little sour when her co-workers “misunderstood” her cake decoration request.

A woman in England reportedly asked her colleagues for a Mariah Carey cake for her birthday — however, she instead received a Marie Curie cake.

Mariah Carey even tweeted a response to the cake mix-up. (2016 Getty Images)

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According to the woman’s cousin on Twitter, the colleagues misunderstood the request for the Grammy-award winning singer and created the cake to feature the two-time Nobel Price-winning scientist.

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Those on Twitter were tickled by the mix-up and left a variety of pun-filled comments referencing the late scientist and her work with radiation.

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Even Carey herself responded to the hilarious mix-up on Twitter, stating she could have been Marie Curie – if she passed math class.

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Carey is currently celebrating the birthday of her debut studio album, which was released this month in 1990.