diff --git a/sys/compat/linuxkpi/common/src/linux_pci.c b/sys/compat/linuxkpi/common/src/linux_pci.c
--- a/sys/compat/linuxkpi/common/src/linux_pci.c
+++ b/sys/compat/linuxkpi/common/src/linux_pci.c
@@ -112,6 +112,9 @@
 	DEVMETHOD(pci_iov_uninit, linux_pci_iov_uninit),
 	DEVMETHOD(pci_iov_add_vf, linux_pci_iov_add_vf),
 
+	/* Bus interface. */
+	DEVMETHOD(bus_add_child, bus_generic_add_child),
+
 	/* backlight interface */
 	DEVMETHOD(backlight_update_status, linux_backlight_update_status),
 	DEVMETHOD(backlight_get_status, linux_backlight_get_status),