The structure of acetoguanamine (or 2,4-diamino-6-methyl-1,3,5-triazine) has been determined as the N,N-dimethyl-formamide solvate, C(4)H(7)N(5)·C(3)H(7)NO. The mol-ecular components are associated in the crystal structure to form ribbons stabilized by three N-H⋯N and one N-H⋯O hydrogen bonds which involve NH groups as donors and the N atoms of the heterocyclic ring and the carbonyl O atom of the solvent as acceptors.