The invention relates to a composition comprising a) a propylene homopolymer and/or a propylene copolymer consisting of at least 70.0 wt % of propylene monomer units and at most 30.0 wt % of comonomer units selected from ethylene monomer units and α-olefin monomer units having 4 to 10 carbon atoms, b) an optional ethylene-α-olefin copolymer, c) glass fibers and d) a reaction product of d1) a functionalized polypropylene and d2) a polyetheramine, wherein the total amount of a) and b) is 10.0 to 80.0 wt % or 20.0 to 80.0 wt % with respect to the total composition, the amount of c) is 5.0 to 50.0 wt % with respect to the total composition, the amount of d2) is at least 5.0 wt % with respect to the total composition and the weight ratio of d2) to d1) is at least 0.050.