The Fourier transform infrared spectrum of the nu(12) band of cis-d(2)-ethylene (cis-C2H2D2) has been recorded with an unapodized resolution of 0.0024 cm(-1) in the frequency range of 1280-1400 cm(-1). This band was found to be mutually coupled by Coriolis interaction with the unobserved 2 nu(10) band situated approximately 10 cm(-1) below nu(12). By fitting a total of 771 infrared transitions of nu(12) with a standard deviation of 0.00075 cm(-1) using the Watson's Hamiltonian with the inclusion of a c-type Coriolis resonance term, a set of accurate rovibrational constants for V-12 = 1 state was derived. The nu(12) band is A type with a band centre at 1341.1512 +/- 0.0001 cm(-1). Accurate rovibrational constants for the V-10 = 2 state were also derived.