The invention relates to a composition for inactivating yeasts or molds in a soft drink comprising calcium ions, characterized in that the composition further comprises a yeast and/or mold inactivation agent selected from a naturally occurring sugar mono fatty acid ester or glycerol mono fatty acid ester, a naturally occurring aliphatic or aromatic organic acid having at least 8 carbon atoms or lactylate ester thereof, or aliphatic or aromatic aldehyde, chitosan, chitin, adipic acid, caproic acid, benzethonium chloride and benzethonium chloride-containing compounds, said composition having a total yeast count <1 cfu/mL. The composition may further contain a preservative.