The invention relates to a composition for producing a thermoplastic moulding material, wherein the composition contains the following constituents:



A) at least one polymer selected from the group consisting of aromatic polycarbonate, aromatic polyestercarbonate and polyester,
B) at least one anhydride-functionalized ethylene-α-olefin copolymer or ethylene-α-olefin terpolymer having a weight-average molecular weight Mw of 50000 to 500000 g/mol determined by high-temperature gel permeation chromatography using ortho-dichlorobenzene as solvent against polystyrene standards,
C) glass fibres,

and also to a process for producing the moulding material, to the moulding material itself, to the use of the composition or of the moulding material for producing moulded articles and to the moulded articles themselves.