diff --git a/target/riscv/vector_helper.c b/target/riscv/vector_helper.c
index 84cec73..fe56c00 100644
--- a/target/riscv/vector_helper.c
+++ b/target/riscv/vector_helper.c
@@ -44,6 +44,7 @@
     target_ulong reserved = s2 &
                             MAKE_64BIT_MASK(R_VTYPE_RESERVED_SHIFT,
                                             xlen - 1 - R_VTYPE_RESERVED_SHIFT);
+    uint16_t vlen = cpu->cfg.vlenb << 3;
     int8_t lmul;
 
     if (vlmul & 4) {
@@ -53,10 +54,8 @@
          * VLEN * LMUL >= SEW
          * VLEN >> (8 - lmul) >= sew
          * (vlenb << 3) >> (8 - lmul) >= sew
-         * vlenb >> (8 - 3 - lmul) >= sew
          */
-        if (vlmul == 4 ||
-            cpu->cfg.vlenb >> (8 - 3 - vlmul) < sew) {
+        if (vlmul == 4 || (vlen >> (8 - vlmul)) < sew) {
             vill = true;
         }
     }