The title compound, C2H4BrNO, crystallizes in the monoclinic space group P21/c with one molecule in the asymmetric unit. The almost planar molecules are organized via N—H...O hydrogen bonds into a ladder-type network, which can be characterized by the graph sets R
2
2(8) and R
2
4(8). In addition, the molecules are connected by C—H...O and C—H...Br contacts.