When commercially produced wood fibres were treated with the enzyme peroxidase and H2O2 for a certain time and then pressed together under conditions usually employed during the process of making fibre boards, boards were obtained which came close to the required standards for German medium density fibre (MDF) boards. Thus, surprisingly, peroxidase in this system gives the same results as laccase, for which this reaction has been described previously. Successful implementation of this process will yield wood composites which can be produced without any addition of resins, solely from naturally grown products.