--- memcheck/tests/vbit-test/irops.c.orig
+++ memcheck/tests/vbit-test/irops.c
@@ -1189,6 +1189,17 @@
   { DEFOP(Iop_ReinterpI128asF128, UNDEF_ALL_64x2), .ppc64 = 1, .ppc32 = 1 },
   { DEFOP(Iop_ReinterpV128asI128, UNDEF_ALL_64x2), .ppc64 = 1, .ppc32 = 1 },
   { DEFOP(Iop_ReinterpI128asV128, UNDEF_ALL_64x2), .ppc64 = 1, .ppc32 = 1 },
+#if defined(VGO_openbsd)
+  /* ------------------ Segment register ------------------ */
+  { DEFOP(Iop_MovFromSeg8, UNDEF_UNKNOWN), },
+  { DEFOP(Iop_MovFromSeg16, UNDEF_UNKNOWN), },
+  { DEFOP(Iop_MovFromSeg32, UNDEF_UNKNOWN), },
+  { DEFOP(Iop_MovFromSeg64, UNDEF_UNKNOWN), },
+  { DEFOP(Iop_MovToSeg8, UNDEF_UNKNOWN), },
+  { DEFOP(Iop_MovToSeg16, UNDEF_UNKNOWN), },
+  { DEFOP(Iop_MovToSeg32, UNDEF_UNKNOWN), },
+  { DEFOP(Iop_MovToSeg64, UNDEF_UNKNOWN), },
+#endif
 };
 
 /* Force compile time failure in case libvex_ir.h::IROp was updated
