  We computed twist-4 part of the photon spin-flip amplitude in deeply virtual
Compton scattering on a nucleon in the Wandzura-Wilczek approximation. We found
a factorizable contribution, which arises from photon scattering on quarks with
non-zero angular momentum along the collision axis. As the genuine twist-2
amplitude arises at the NLO, for moderate virtualities of the hard photon, $Q^2
\le 10$ GeV$^2$, kinematical twist-4 correction can give numerically important
contribution to the photon helicity-flip amplitude.
