diff --git a/tools/tools/nanobsd/defaults.sh b/tools/tools/nanobsd/defaults.sh
--- a/tools/tools/nanobsd/defaults.sh
+++ b/tools/tools/nanobsd/defaults.sh
@@ -768,6 +768,10 @@
 	populate_slice "$1" "$2" "$3" "$4"
 )
 
+_populate_cfg_part ( ) (
+	_populate_part "cfg" "$1" "$2" "$3" "$4" "$5"
+)
+
 populate_data_slice ( ) (
 	populate_slice "$1" "$2" "$3" "$4"
 )