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A new polymorph of N,N′-bis(2,6-diisopropylphenyl)formamidine, C25H36N2, is reported, which is different from the previously reported orthorhombic structure. The molecule crystallizes in the E–anti configuration, with tautomeric disorder of the N-bonded H atoms and no clear distinction between imine and amine functionalities. The molecules form hydrogen-bonded dimers with intermolecular N...N distances shorter than those in the orthorhombic polymorph.