In this work we investigate the role of the beam astigmatism in the
Goos-H\"anchen and Imbert-Fedorov shift. As a case study, we consider a
Gaussian beam focused by an astigmatic lens and we calculate explicitly the
corrections to the standard formulas for beam shifts due to the astigmatism
induced by the lens. Our results show that astigmatism may enhance the angular
part of the shift
