diff --git a/arch/X86/X86Disassembler.c b/arch/X86/X86Disassembler.c
index b6eca36..95ed978 100644
--- a/arch/X86/X86Disassembler.c
+++ b/arch/X86/X86Disassembler.c
@@ -959,6 +959,7 @@
 			reader(&info, &b1, address);
 			reader(&info, &b2, address + 1);
 			if (b1 == 0x0f && b2 == 0xff) {
+				instr->Opcode = X86_UD0;
 				instr->OpcodePub = X86_INS_UD0;
 				strncpy(instr->assembly, "ud0", 4);
 				if (instr->flat_insn->detail) {