  We compute the full $\mathcal{O}(\alpha_s)$ corrections to stop-antistop
annihilation into two gluons and a light quark-antiquark pair within the
framework of the Minimal Supersymmetric Standard Model (MSSM), including the
non-perturbative Sommerfeld enhancement effect. Numerical results for the total
annihilation cross section are shown and the effect on the neutralino relic
density is discussed for an example scenario in the phenomenological MSSM.
