  Cosmic rays are an important tool to study dark matter annihilation in our
Galaxy. Recently, a possible hint for dark matter annihilation was found in the
antiproton spectrum measured by AMS-02, even though the result might be
affected by theoretical uncertainties. A complementary way to test its dark
matter interpretation would be the observation of low-energy antinuclei in
cosmic rays. We determine the chances to observe antideuterons with GAPS and
AMS-02, and the implications for the ongoing AMS-02 antihelium searches. We
find that the corresponding antideuteron signal is within the GAPS and AMS-02
detection potential. If, more conservatively, the putative signal was
considered as an upper limit on DM annihilation, our results would indicate the
highest possible fluxes for antideuterons and antihelium compatible with
current antiproton data.
