The use of an agent containing, in a cosmetically acceptable carrier, a) at least one non-ionic, propylene oxide-modified starch in an amount of from 4.0 wt.% to 15 wt.% based on the weight of the agent, wherein the non-ionic, propylene oxide-modified starch has an average molecular weight (weight average) of from 700 to 1000 kDa, and wherein the non-ionic, propylene oxide-modified starch has a propylene oxide content of from 1 to 20 wt.% based on the weight of the modified starch, and b) at least one film-forming and/or setting polymer in an amount of from 1.0 wt.% to 9.0 wt.%, based on the weight of the agent, wherein the film-forming and/or setting polymer comprises at least one structural unit of formula and at least one structural unit of formula, in which R 1 und R 2 denote, independently of one another, a hydrogen atom or a methyl group, provided that R 1 and R 2 do not simultaneously denote a methyl group, R 3 denotes a hydrogen atom or a methyl group, R 4 denotes a carbamoyl group, a linear or branched (C 4 to C 12) alkyl aminocarbonyl group, a linear or branched (C 4 to C 12) alkyl aminoethyl aminocarbonyl group, a linear or branched (C 4 to C 12) alkyl aminopropyl aminocarbonyl group, a linear or branched (C 4 to C 12) alkyl oxycarbonyl group, a linear or branched (C 4 to C 12) alkyl aminoethyl oxycarbonyl group, a linear or branched (C 2 to C 12) alkyl aminopropyl oxycarbonyl group, a linear or branched (C 2 to C 12) acyloxy group, A 1 denotes a hydroxy group or an organic functional group that has at least one sulfonic acid group and binds to the structural fragment via an oxygen atom or an NH group, for improving the color retention of oxidatively colored keratin-containing fibers, in particular oxidatively colored human hair. a) at least one non-ionic, propylene oxide-modified starch in an amount of from 4.0 wt.% to 15 wt.% based on the weight of the agent, wherein the non-ionic, propylene oxide-modified starch has an average molecular weight (weight average) of from 700 to 1000 kDa, and wherein the non-ionic, propylene oxide-modified starch has a propylene oxide content of from 1 to 20 wt.% based on the weight of the modified starch, and b) at least one film-forming and/or setting polymer in an amount of from 1.0 wt.% to 9.0 wt.%, based on the weight of the agent, wherein the film-forming and/or setting polymer comprises at least one structural unit of formula and at least one structural unit of formula, in which R 1 und R 2 denote, independently of one another, a hydrogen atom or a methyl group, provided that R 1 and R 2 do not simultaneously denote a methyl group, R 3 denotes a hydrogen atom or a methyl group, R 4 denotes a carbamoyl group, a linear or branched (C 4 to C 12) alkyl aminocarbonyl group, a linear or branched (C 4 to C 12) alkyl aminoethyl aminocarbonyl group, a linear or branched (C 4 to C 12) alkyl aminopropyl aminocarbonyl group, a linear or branched (C 4 to C 12) alkyl oxycarbonyl group, a linear or branched (C 4 to C 12) alkyl aminoethyl oxycarbonyl group, a linear or branched (C 2 to C 12) alkyl aminopropyl oxycarbonyl group, a linear or branched (C 2 to C 12) acyloxy group, A 1 denotes a hydroxy group or an organic functional group that has at least one sulfonic acid group and binds to the structural fragment via an oxygen atom or an NH group, for improving the color retention of oxidatively colored keratin-containing fibers, in particular oxidatively colored human hair. R 1 und R 2 denote, independently of one another, a hydrogen atom or a methyl group, provided that R 1 and R 2 do not simultaneously denote a methyl group, R 3 denotes a hydrogen atom or a methyl group, R 4 denotes a carbamoyl group, a linear or branched (C 4 to C 12) alkyl aminocarbonyl group, a linear or branched (C 4 to C 12) alkyl aminoethyl aminocarbonyl group, a linear or branched (C 4 to C 12) alkyl aminopropyl aminocarbonyl group, a linear or branched (C 4 to C 12) alkyl oxycarbonyl group, a linear or branched (C 4 to C 12) alkyl aminoethyl oxycarbonyl group, a linear or branched (C 2 to C 12) alkyl aminopropyl oxycarbonyl group, a linear or branched (C 2 to C 12) acyloxy group, A 1 denotes a hydroxy group or an organic functional group that has at least one sulfonic acid group and binds to the structural fragment via an oxygen atom or an NH group, for improving the color retention of oxidatively colored keratin-containing fibers, in particular oxidatively colored human hair.