The title mol-ecule, C12H11Cl3N2O2, contains planar quinazolin-4(3H)-one (r.m.s. deviation = 0.0257 Å) and propyl fragments, forming a dihedral angle of 10.4 (2)°. An intra-molecular O-H⋯N hydorgen bond occurs. In the crystal, O-H⋯O hydrogen bonds link the mol-ecules into an infinite chain running parallel to the b axis.