diff --git a/lib/virtio/virtio_user.c b/lib/virtio/virtio_user.c
index ab9cce2ba..a45d36ca0 100644
--- a/lib/virtio/virtio_user.c
+++ b/lib/virtio/virtio_user.c
@@ -365,8 +365,8 @@ virtio_user_del_queue(struct virtio_dev *vdev, struct virtqueue *vq)
 	 * For modern devices, set queue desc, avail, used in PCI bar to 0,
 	 * not see any more behavior in QEMU.
 	 *
-	 * Here we just care about what information to deliver to vhost-user
-	 * or vhost-kernel. So we just close ioeventfd for now.
+	 * Here we just care about what information to deliver to vhost-user.
+	 * So we just close ioeventfd for now.
 	 */
 	struct virtio_user_dev *dev = vdev->ctx;
 
diff --git a/lib/virtio/virtio_user/vhost.h b/lib/virtio/virtio_user/vhost.h
index 35a1af349..bb8879ecd 100644
--- a/lib/virtio/virtio_user/vhost.h
+++ b/lib/virtio/virtio_user/vhost.h
@@ -71,10 +71,8 @@ enum vhost_user_request {
 struct virtio_user_backend_ops;
 
 struct virtio_user_dev {
-	/* for vhost_user backend */
 	int		vhostfd;
 
-	/* for both vhost_user and vhost_kernel */
 	int		callfds[SPDK_VIRTIO_MAX_VIRTQUEUES];
 	int		kickfds[SPDK_VIRTIO_MAX_VIRTQUEUES];
 	uint32_t	queue_size;
@@ -101,6 +99,5 @@ struct vhost_user_config {
 };
 
 extern struct virtio_user_backend_ops ops_user;
-extern struct virtio_user_backend_ops ops_kernel;
 
 #endif