Published data on the Fourier transform spectrum of (C2HD)-C-12 in the overtone range, from Lievin et al. [Chem. Phys. 10 (1995) 419] and Abbouti Temsamani and Herman [Mol. Phys. 79 (1993) 359], are revisited by taking into account the (1/255) anharmonic resonance. A dedicated Hamiltonian is used to build interacting clusters. New vibrational parameters are obtained which account for previously reported anomalous spectral features.