diff --git a/arch/X86/X86Disassembler.c b/arch/X86/X86Disassembler.c
index b80e68c4..e5ed556f 100644
--- a/arch/X86/X86Disassembler.c
+++ b/arch/X86/X86Disassembler.c
@@ -835,6 +835,12 @@ bool X86_getInstruction(csh ud, const uint8_t *code, size_t code_len,
 
 		result = (!translateInstruction(instr, &insn)) ?  true : false;
 		if (result) {
+			// quick fix for #904. TODO: fix this properly in the next update
+			if (handle->mode & CS_MODE_64 &&
+				(instr->Opcode == X86_LES16rm || instr->Opcode == X86_LES32rm))
+				// LES is invalid in x64
+				return false;
+
 			instr->imm_size = insn.immSize;
 			if (handle->detail) {
 				update_pub_insn(instr->flat_insn, &insn, instr->x86_prefix);