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We report the results of the first X-ray observation of the luminous andhelium-rich O-type subdwarf BD+37 442, carried out with the XMM-Newtonsatellite in August 2011. X-ray emission is detected with a flux of about3x10^(-14) erg/cm2/s (0.2-1 keV) and a very soft spectrum, well fit by the sumof a blackbody with temperature kT_BB = 45^(+11)_(-9) eV and a power law with apoorly constrained photon index. Significant pulsations with a period of 19.2 sare detected, indicating that the X-ray emission originates in a white dwarf orneutron star companion, most likely powered by accretion from the wind of BD+37442.

Discovery of a compact companion to the hot subdwarf star BD+37 442