A horizontally split flow machine housing, particularly for a radial compressor, has a top housing part and a bottom housing part and a top stator part which is received in the top housing part and is prevented from falling out in that the top stator part is supported from the top by stator stops on housing stops. At least one housing stop is fastened to the top housing part in such a way that it can be adjusted toward a stator stop during assembly and is supported at the top housing part below a point of contact between the stator stop and housing stop.