--- memcheck/mc_translate.c.orig
+++ memcheck/mc_translate.c
@@ -4222,6 +4222,12 @@ IRAtom* expr2vbits_Binop ( MCEnv* mce,
                           binop(Iop_V128HLtoV256, qV, shV));
       }
 
+#if defined(__OpenBSD__)
+      case Iop_MovFromSeg64:
+      case Iop_MovToSeg64:
+         return assignNew('V', mce, Ity_I64, binop(op, atom1, atom2));
+#endif
+
       default:
          ppIROp(op);
          VG_(tool_panic)("memcheck:expr2vbits_Binop");
