A mounting assembly for plough skimmers comprises a mounting rail adapted to be connected to the main frame of a plough and a skimmer support bracket adapted to surround parts of the mounting rail. The mounting rail and the skimmer support bracket are arranged such that the mounting rail and the skimmer support bracket are braced against each other in at least two directions when the plough skimmer is in use, wherein the at least two directions are oblique to a ploughing direction.