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The IceCube Collaboration foresees to upgrade IceTop, the present surfacearray, with scintillator detectors augmented by radio antennas. As one ofseveral goals the scintillator detectors will be used to measure and mitigatethe effects of snow accumulation on the IceTop tanks: the increasing energythreshold and efficiency loss are nowadays the sources of the largestsystematic uncertainties in shower reconstruction and mass compositionanalysis. In addition, the upgrade will provide useful experience for thedevelopment of next generation neutrino detectors proposed for the South Pole.In the Austral summer season, 2017-2018 two full "stations" were installed nearthe center of the IceTop array. Each station features custom-designedelectronics and consists of seven detectors, each having an active area of1.5m$^{2}$ plastic scintillator and wavelength shifting fibers read out by aSilicon Photomultiplier. In this contribution we review the detector design andperformance, and show results from more than one year of operation of theprototype stations. During that year several thousand air shower events havebeen measured in coincidence with IceTop.

The Scintillator Upgrade of IceTop: Performance of the prototype array