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In the crystal structure of the title compound, C8H9N2+·SCN−, the nearly planar 2-methylbenzimidazolium cation [r.m.s. deviation = 0.0123 (4) Å] is perpendicular to a mirror plane and the methyl H atoms are disordered about the mirror plane with equal occupancies. The thiocyanate anion also lies on a mirror plane. N—H...N hydrogen bonds link the components into an infinite chain along the b axis.