In the title compound, C12H16BrNO2, the dioxane ring adopts a chair conformation and its mean plane makes a dihedral angle of 60.63 (12)° with the 4-bromophenyl ring. In the crystal, molecules are linked by pairs of N - H⋯O hydrogen bonds, forming inversion dimers with an R 2 2(8) ring motif. These dimers are consolidated by pairs of C - H⋯O hydrogen bonds with an R 2 2(16) ring motif. Adjacent dimers are connected via C - H⋯O hydrogen bonds, forming infinite chains propagating along the c-axis direction.