diff --git a/libavfilter/riscv/af_afir_rvv.S b/libavfilter/riscv/af_afir_rvv.S
index 2107d97166..5ebd020e75 100644
--- a/libavfilter/riscv/af_afir_rvv.S
+++ b/libavfilter/riscv/af_afir_rvv.S
@@ -22,6 +22,7 @@
 
 //  void ff_fcmul_add(float *sum, const float *t, const float *c, int len)
 func ff_fcmul_add_rvv, zve64f, zba
+        lpad    0
         li          t1, 32
 1:
         vsetvli     t0, a3, e32, m4, ta, ma