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The title compound, C5H10NO+·HSO4−, has been synthesized by reaction of 1-methylpyrrolidin-2-one with H2SO4 in a 1:1 molar ratio. The substituted pyrrolium ring adopts an envelope conformation. The hydrogensulfate anions form infinite helical chains parallel to the a axis via strong O—H...O hydrogen bonds. The pyrrolium cations are pendant from the chains. These cations are the hydrogen donors in the strong O—H...O hydrogen bonds to the hydrogensulfates. In addition, there are weak C—H...O hydrogen bonds in the structure.