You should request that the payer of these dividends issue a corrected 1099-MISC showing zero income, and issue you a Form 1099-DIV that reports this income.
There's a presumption, although it's not always true, that 1099-MISC income represents self-employment income, subject to self-employment tax (see the TurboTax Help article "Does a 1099-MISC mean I'm self-employed?"). That's why it's important to have your income reported on a 1099-DIV, especially if the amount is over $400 (that's when the self-employment tax kicks in).
That said… if the payer refuses to issue a corrected 1099-MISC for zero, and issue you a 1099-DIV, please see IreneS' guidance; this is for a different type of income, and for 2018, but the guidance is still valid.
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