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An intermetallic phase in the Al–Mn–Ni system crystallizing in space group Cmcm (No. 63) and refined formula Al61.49Mn11.35Ni4 (called the R′ phase) has been synthesized by high-temperature sintering of a mixture with initial chemical composition Al60Mn7Ni3. In comparison with the structure model of the previously reported R phase with composition Al60Mn11Ni4 [Robinson (1954). Acta Cryst. 7, 494–497], there are two mutually exchanged Mn and Ni sites together with one positionally disordered Al site [occupancy ratio 0.811 (8):0.121 (7)] and one partially occupied Mn site [s.o.f. 0.677 (5)] in the current structure model of the R′ phase.