The magnetic properties of UCo1-xFexSn solid solutions in the limited homogeneity range up to x=0.15 were studied. A monotonous increase of both TC (from 83 K to 98.5 K) and the magnetic moment (from 1.21 μB f.u.-1 to 1.29 μB f.u.-1) with increasing Fe content has been observed. This behaviour is discussed in terms of a varying 5f-d hybridization.