A redispersible dispersion powder comprising: a) a base polymer selected from the group consisting of vinyl ester homo- and copolymers, b) from 2 to 20% by weight, based on the overall mass of the base polymer a), of polyvinyl alcohol, said polyvinyl alcohol having a degree of hydrolysis of from 70 to 100 mol-% and a viscosity in a 4% aqueous solution of from 2 to 70 mPa.s, c) from 0 to 50% by weight, based on the overall mass of the components a) and b), of anticaking agent, d) from 0.001 to 5% by weight, based on the overall mass of the components a) and b), of water- soluble, at least bifunctional, masked aldehydes having at least 3 carbon atoms, said masked aldehydes being capable of controllably releasing aldehyde groups in an acidic medium, e) from 0 to 25% by weight, based on the overall mass of the base polymer a), of additives selected from the group consisting of film-forming auxiliaries and plasticizers, and f) from 0 to 10% by weight, based on the overall mass of the components a) and b), of free Bronsted or Lewis acids which are present as solids or adsorbed on a carrier material.