diff --git a/arch/AArch64/AArch64GenDisassemblerTables.inc b/arch/AArch64/AArch64GenDisassemblerTables.inc
index 55dd1bae71..4d0a762778 100644
--- a/arch/AArch64/AArch64GenDisassemblerTables.inc
+++ b/arch/AArch64/AArch64GenDisassemblerTables.inc
@@ -28341,7 +28341,7 @@ static const uint8_t DecoderTableFallback32[] = {
 
 static bool checkDecoderPredicate(MCInst *Inst, unsigned Idx) {
   switch (Idx) {
-  default: /* llvm_unreachable("Invalid index!"); */
+  default: CS_ASSERT_RET_VAL(0 && "Invalid index!", false);
   case 0:
     return (AArch64_getFeatureBits(Inst->csh->mode, AArch64_FeatureAll) || AArch64_getFeatureBits(Inst->csh->mode, AArch64_FeatureSME));
   case 1:
@@ -28552,7 +28552,7 @@ static DecodeStatus fname(DecodeStatus S, unsigned Idx, InsnType insn, MCInst *M
   *DecodeComplete = true; \
   InsnType tmp; \
   switch (Idx) { \
-  default: /* llvm_unreachable("Invalid index!"); */ \
+  default: CS_ASSERT_RET_VAL(0 && "Invalid index!", MCDisassembler_Fail); \
   case 0: \
     tmp = fieldname(insn, 0, 16); \
     MCOperand_CreateImm0(MI, tmp); \