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How the accreted mass settling on the surface of a neutron star affects thetopology of the magnetic field and how the secular evolution of the binarysystem depends on the magnetic field change is still an open issue. We reportevidence for a clear drop in the observed magnetic field in the accretingpulsar V0332+53 after undergoing a bright 3-month long X-ray outburst. Wedetermine the field from the position of the fundamental cyclotron line in itsX-ray spectrum and relate it to the luminosity. For equal levels of luminosity,in the declining phase we measure a systematically lower value of the cyclotronline energy with respect to the rising phase. This results in a drop of ~1.7 x10^11 G of the observed field between the onset and the end of the outburst.The settling of the accreted plasma onto the polar cap seems to induce adistortion of the magnetic field lines weakening their intensity along theaccretion columns. Therefore the dissipation rate of the magnetic field couldbe much faster than previously estimated, unless the field is able to restoreits original configuration on a time-scale comparable with the outburstsrecurrence time.

An unexpected drop in the magnetic field of the X-ray pulsar V0332+53 after the bright outburst occurred in 2015