diff --git a/qemu/target/riscv/insn_trans/trans_rvv.inc.c b/qemu/target/riscv/insn_trans/trans_rvv.inc.c
index 5b794c7d..c0dc841a 100644
--- a/qemu/target/riscv/insn_trans/trans_rvv.inc.c
+++ b/qemu/target/riscv/insn_trans/trans_rvv.inc.c
@@ -743,6 +743,7 @@ static bool amo_op(DisasContext *s, arg_rwdvm *a, uint8_t seq)
             g_assert_not_reached();
 #endif
         } else {
+            assert(seq < ARRAY_SIZE(fnsw));
             fn = fnsw[seq];
         }
     }