--- memcheck/mc_translate.c.orig
+++ memcheck/mc_translate.c
@@ -5021,6 +5021,12 @@
          return mkUifUV128(mce, narrowed, rmPCasted);
       }
 
+#if defined(VGO_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");