Use of cellulosic fibre pulp having a Schopper-Riegler number according to ISO 5267-1 of about 70 or more as an additive to papermaking pulp for enhancing compressive strength of paper or board manufactured from the papermaking pulp. A process for enhancing compressive strength of paper or board manufactured from a papermaking pulp, comprising use of a cellulosic fibre pulp having a Schopper-Riegler number according to ISO 5267-1 of about 70 or more as a component of the papermaking pulp.