Binders (I) that consist of alkyd resins based on vegetable oils and/or acrylate dispersions and have a pH of 7 or less in w are used to stabilize hydrolysis-sensitive active ingredients in aqueous systems. Independent claims are also included for the following: (1) aqueous systems comprising at least one hydrolysis-sensitive active ingredient in combination with (I); (2) use of (I) in combination with hydrolysis-sensitive active ingredients to protect aqueous systems against microbial att and (3) (I) in combination with hydrolysis-sensitive active ingredients.