The present invention relates to a pharmaceutical aqueous formulation comprising 1-(4-{[4-(dimethylamino)piperidin-1-yl]carbonyl}phenyl)-3-[4-(4,6-dimorpholin-4-yl-1,3,5-triazin-2-yl)phenyl]urea, or a pharmaceutically acceptable organic or inorganic acid salt thereof, a pharmaceutically acceptable organic or inorganic acid, a pharmaceutically acceptable beta- or gamma-cyclodextrin and water, that is a clear solution, with the proviso that the organic or inorganic acid (including a salt thereof) is not a sulphonic acid. Such a formulation is particularly suitable for intravenous or parenteral administration to a patient.