diff --git a/tools/idem_apt_install b/tools/idem_apt_install
index 7233246..46996de 100755
--- a/tools/idem_apt_install
+++ b/tools/idem_apt_install
@@ -16,7 +16,8 @@ function usage {
     exit 1
 }
 
-source "$MIAOU_BASH_DIR"/lib/functions.sh
+BASEDIR=$(dirname "$0")
+source "$BASEDIR"/../lib/functions.sh
 
 [ "$(id -u)" -ne 0 ] && echo 'root privilege required' && exit 2
 [[ $# -lt 1 ]] && usage