diff --git a/sys/dev/pci/virtio.c b/sys/dev/pci/virtio.c
index 70209f164a86..1ffd6c62fe35 100644
--- a/sys/dev/pci/virtio.c
+++ b/sys/dev/pci/virtio.c
@@ -784,9 +784,9 @@ virtio_alloc_vq(struct virtio_softc *sc, struct virtqueue *vq,
 
 	size_desc = sizeof(vq->vq_desc[0]) * vq_num;
 	size_avail = sizeof(uint16_t) * hdrlen
-	    + sizeof(vq->vq_avail[0].ring) * vq_num;
+	    + sizeof(vq->vq_avail[0].ring[0]) * vq_num;
 	size_used = sizeof(uint16_t) *hdrlen
-	    + sizeof(vq->vq_used[0].ring) * vq_num;
+	    + sizeof(vq->vq_used[0].ring[0]) * vq_num;
 	size_indirect = (sc->sc_indirect && maxnsegs >= MINSEG_INDIRECT) ?
 	    sizeof(struct vring_desc) * maxnsegs * vq_num : 0;