The invention provides a composition which is suitable for the delivery of RNA, which composition comprises (i) particles contained in a liquid phase, wherein the particles comprise RNA and a lipid composition, and (ii) 1,2 propanediol. The lipid composition comprises (i-a) a cholesterol derivative, (i-b) a phosphoglyceride, and (i-c) a pegylated phosphoglyceride. Further provided are a method for preparing the composition, and a solid composition which is obtainable by freezing the composition wherein particles are contained in a liquid phase.
