diff --git a/libswscale/riscv/rgb2rgb_rvv.S b/libswscale/riscv/rgb2rgb_rvv.S
index 5626d906eb..bbdfdbebbc 100644
--- a/libswscale/riscv/rgb2rgb_rvv.S
+++ b/libswscale/riscv/rgb2rgb_rvv.S
@@ -85,7 +85,7 @@ func ff_interleave_bytes_rvv, zve32x
         mv      t3, a3
         addi    a4, a4, -1
 2:
-        vsetvli    t4, t3, e8, ta, ma
+        vsetvli    t4, t3, e8, m1, ta, ma
         sub        t3, t3, t4
         vle8.v     v8, (t0)
         add        t0, t4, t0