diff --git a/src/vnet/dev/dev.c b/src/vnet/dev/dev.c
index 0e04e9a..e04fa16 100644
--- a/src/vnet/dev/dev.c
+++ b/src/vnet/dev/dev.c
@@ -399,6 +399,7 @@
 	.mac_addr_change_function = vnet_dev_port_mac_change,
 	.mac_addr_add_del_function = vnet_dev_add_del_mac_address,
 	.flow_ops_function = vnet_dev_flow_ops_fn,
+	.format_flow = format_vnet_dev_flow,
 	.set_rss_queues_function = vnet_dev_interface_set_rss_queues,
       };
       driver->dev_class_index = vnet_register_device_class (vm, dev_class);