The results of an experiment to measure the 12C(n,n′)3α reaction in nuclear emulsions up to 35 MeV were reanalyzed, with various corrections made using a previously validated nuclear reaction model. Corrections of up to 27% to the published data were obtained, and the corrected results, suggested as an evaluated set of cross sections, are in agreement with low-energy time-of-flight data and also with the predictions of the nuclear reaction model. Corresponding experimental data at 50 MeV also exist; however, they are considered unreliable and calculated data are recommended above 35 MeV.