diff --git a/drivers/vhost/vhost-rng.c b/drivers/vhost/vhost-rng.c
index 0ed1477167e..f287a888109 100644
--- a/drivers/vhost/vhost-rng.c
+++ b/drivers/vhost/vhost-rng.c
@@ -89,7 +89,6 @@ static void vhost_rng_work(FAR void *arg)
   irqstate_t flags;
   uint16_t idx;
   uint32_t len;
-  ssize_t ret;
 
   vq = priv->hdev->vrings_info[0].vq;
   flags = spin_lock_irqsave(&priv->lock);
@@ -105,7 +104,7 @@ static void vhost_rng_work(FAR void *arg)
       arc4random_buf(buf, len);
 
       flags = spin_lock_irqsave(&priv->lock);
-      virtqueue_add_consumed_buffer(vq, idx, (uint32_t)ret);
+      virtqueue_add_consumed_buffer(vq, idx, len);
       virtqueue_kick(vq);
     }