diff --git a/drivers/virtio/virtio-net.c b/drivers/virtio/virtio-net.c
index 0e3142c6976..93d94818b18 100644
--- a/drivers/virtio/virtio-net.c
+++ b/drivers/virtio/virtio-net.c
@@ -591,7 +591,7 @@ static void virtio_net_set_macaddr(FAR struct virtio_net_priv_s *priv)
 #ifdef CONFIG_NETDEV_IFINDEX
             dev->d_ifindex
 #else
-            dev % 256
+            (uintptr_t)dev % 256
 #endif
           );