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In the redetermination of the title compound, C3H5N2OS+·CI−, the asymmetric unit consists of one independent 2-oxo-1,3-thiazolidin-4-iminium cation and one independent chloride anion. The cation interacts with a chloride anion via N—H...Cl hydrogen bonds forming a supramolecular chain along [010]. These supramolecular chains are further extended by weak C—H...Cl and C—H...O interactions, forming a two-dimensional network parallel to (001). The crystal structure is further stabilized by weak C—O...π interactions, supporting a three-dimensional architecture. The structure was previously determined by Ananthamurthy & Murthy [Z. Kristallogr. (1975). 8, 356–367] but has been redetermined with higher precision to allow the hydrogen-bonding patterns and supramolecular interactions to be investigated.