diff --git a/sys/dev/cfi/cfi_core.c b/sys/dev/cfi/cfi_core.c
index 112ece2fe552..6179f0a5a79a 100644
--- a/sys/dev/cfi/cfi_core.c
+++ b/sys/dev/cfi/cfi_core.c
@@ -285,8 +285,7 @@ cfi_attach(device_t dev)
 	    "%s%u", cfi_driver_name, u);
 	sc->sc_nod->si_drv1 = sc;
 
-	device_add_child(dev, "cfid",
-	    devclass_find_free_unit(cfi_diskclass, 0));
+	device_add_child(dev, "cfid", -1);
 	bus_generic_attach(dev);
 
 	return (0);