diff --git a/lib/boot/boot.in b/lib/boot/boot.in
index d263a26..19995d2 100644
--- a/lib/boot/boot.in
+++ b/lib/boot/boot.in
@@ -46,5 +46,11 @@ else
 	echo_status "boot: using $bootloader."
 fi
 
+# stub boot_cd_*() functions
+#
+boot_cd_pre() { echo_status "No specific boot_cd_pre() available."; }
+boot_cd_add() { echo_status "No specific boot_cd_add() available."; }
+boot_cd_post() { echo_status "No specific boot_cd_post() available."; }
+
 . "package/$bootloader/boot/boot.in"