An arrangement for loading a cargo space includes a transfer element as part of the transfer apparatus, which is arranged to move, together with load units to be arranged on top of it, into a cargo space and back out of there leaving the load units in the cargo space and means for forming a protective wall between the structure defining the cargo space and the load units. The forming of the protective wall is synchronized with the movement of the transfer element. In addition, an apparatus is disclosed for forming a protective wall in a cargo space and a method for loading a cargo space.