Use of a single-component synthetic fixing resin for fixing an anchoring element in a hole in a water-containing building substrate, wherein the single-component synthetic fixing resin is one based on a reactive mixture producible using a silane-containing mixture of (a) at least one compound that includes one or more silane groups and (b) a silicone resin that includes at least one hydrolysable Si-bonded group, for fixing anchoring elements in holes in building substrates with water-containing hole walls, wherein, after the curing thereof, bond stresses of from 12 to 35 N/mm 2, a tensile strength of from 10 to 20 MPa, a tensile modulus of from 1 to 5 GPa and a tensile elongation of 3 % or less are obtained; wherein the at least one compound that includes one or more silane groups mentioned under (a) includes one or more compounds having per molecule at least one silane terminal group of the partial formula wherein the dashed bond represents the bond to the rest of the molecule, especially a polyethylene glycol or polypropylene glycol or polyurethane, the radicals R independently of one another denote C 1 -C 18 alkyl, especially methyl or ethyl, or C 1 -C 18 alkoxy, with the proviso that at least one of the radicals denotes C 1 -C 18 alkoxyl, X denotes NH or preferably O, and n denotes a number from 1 to 3, especially with the proviso that at least some of the radicals have an n = 1, preferably that n is 1, and the silicone resin that includes at least one hydrolysable Si-bonded group mentioned under (b) includes units of the formula R 1 a (R 2 O) b R 3 c SiO (4-a-b-c)/2 wherein R 1 can be identical or different and is hydrogen, a monovalent, SiC-bonded C 1 -C 18 alkyl radical, which can be unsubstituted or substituted, or a divalent unsubstituted or substituted C 1 -C 18 alkyl radical which bridges two units of the formula; R 2 can be identical or different and is hydrogen or a divalent C 1 -C 18 alkyl radical which can be unsubstituted or substituted, R 3 can be identical or different and is a monovalent, SiC-bonded phenyl radical which in each case can be preferably unsubstituted or, furthermore, substituted, a is 0, 1, 2 or 3, b is 0, 1, 2 or 3, preferably 0, 1 or 2, especially preferably 0 or 1, and c is 0, 1 or 2, preferably 0 or 1, with the proviso that the sum of a + b + c is less than or equal to 3 and preferably in at least 40 of the units of the formula the sum of b + c is 0 or 1; and wherein the bond stresses are measured by creating drilled holes of 14 mm diameter and 95 mm depth in the building substrate at room temperature, with the drilled holes being cleaned by 2 x blowing, 2 x brushing and 2 x blowing, and filling the drilled holes with the single-component composition and screwing M12 threaded rods into the composition while still soft and, after the curing time, subjecting the fixing to an adhesion failure test, and wherein the tensile strength, the tensile modulus and the tensile elongation are determined using dumbbell test specimens of type 1 BA having a total length of 75.6 mm, a length of the parallel portion of 39 mm, a clamping length of 58 mm, and a pulling speed of 5 mm/min in accordance with DIN EN ISO 527. (a) at least one compound that includes one or more silane groups and (b) a silicone resin that includes at least one hydrolysable Si-bonded group, R 1 can be identical or different and is hydrogen, a monovalent, SiC-bonded C 1 -C 18 alkyl radical, which can be unsubstituted or substituted, or a divalent unsubstituted or substituted C 1 -C 18 alkyl radical which bridges two units of the formula; R 2 can be identical or different and is hydrogen or a divalent C 1 -C 18 alkyl radical which can be unsubstituted or substituted, R 3 can be identical or different and is a monovalent, SiC-bonded phenyl radical which in each case can be preferably unsubstituted or, furthermore, substituted, a is 0, 1, 2 or 3, b is 0, 1, 2 or 3, preferably 0, 1 or 2, especially preferably 0 or 1, and c is 0, 1 or 2, preferably 0 or 1, with the proviso that the sum of a + b + c is less than or equal to 3 and preferably in at least 40 of the units of the formula the sum of b + c is 0 or 1; and wherein the bond stresses are measured by creating drilled holes of 14 mm diameter and 95 mm depth in the building substrate at room temperature, with the drilled holes being cleaned by 2 x blowing, 2 x brushing and 2 x blowing, and filling the drilled holes with the single-component composition and screwing M12 threaded rods into the composition while still soft and, after the curing time, subjecting the fixing to an adhesion failure test, and wherein the tensile strength, the tensile modulus and the tensile elongation are determined using dumbbell test specimens of type 1 BA having a total length of 75.6 mm, a length of the parallel portion of 39 mm, a clamping length of 58 mm, and a pulling speed of 5 mm/min in accordance with DIN EN ISO 527.