diff --git a/qemu/target/riscv/csr.c b/qemu/target/riscv/csr.c
index ef5e1cf1..aa2f027e 100644
--- a/qemu/target/riscv/csr.c
+++ b/qemu/target/riscv/csr.c
@@ -61,7 +61,7 @@ static int vs(CPURISCVState *env, int csrno)
     if (env->misa & RVV) {
         return 0;
     }
-    return -1;
+    return -RISCV_EXCP_ILLEGAL_INST;
 }
 
 static int ctr(CPURISCVState *env, int csrno)