diff --git a/live-build/ubuntu-server/hooks/05-netboot-tarball.binary b/live-build/ubuntu-server/hooks/05-netboot-tarball.binary
index 72dea4ef..5c23a8a9 100755
--- a/live-build/ubuntu-server/hooks/05-netboot-tarball.binary
+++ b/live-build/ubuntu-server/hooks/05-netboot-tarball.binary
@@ -21,6 +21,8 @@ case $PASS in
         ;;
 esac
 
+. config/functions
+
 set -eux
 
 # Extract the flavor from the pass name