diff --git a/live-build/ubuntu-mini-iso/hooks/01-mini-iso.binary b/live-build/ubuntu-mini-iso/hooks/01-mini-iso.binary
index 875430ff..6a920cd7 100755
--- a/live-build/ubuntu-mini-iso/hooks/01-mini-iso.binary
+++ b/live-build/ubuntu-mini-iso/hooks/01-mini-iso.binary
@@ -4,6 +4,8 @@
 
 set -eu
 
+. config/functions
+
 case $ARCH in
     amd64)
         ;;
diff --git a/live-build/ubuntu-server/hooks/04-kernel-bits.binary b/live-build/ubuntu-server/hooks/04-kernel-bits.binary
index cbc228b7..cf38b36b 100755
--- a/live-build/ubuntu-server/hooks/04-kernel-bits.binary
+++ b/live-build/ubuntu-server/hooks/04-kernel-bits.binary
@@ -1,6 +1,8 @@
 #!/bin/bash -eux
 # vi: ts=4 noexpandtab
 
+. config/functions
+
 case $PASS in
     ubuntu-server-minimal.ubuntu-server.installer.*.*)
         exit 0