diff --git a/cd.sh b/cd.sh
index c44e39a..72a7b1e 100644
--- a/cd.sh
+++ b/cd.sh
@@ -74,6 +74,7 @@ function cd_set_packages_configuration {
     cd_step "${FUNCNAME}"
     case "${CD_OS_NAME}" in
         'debian')
+            export DEBIAN_FRONTEND='noninteractive'
             cd_write '/etc/apt/apt.conf.d/apt.conf' "\
 Acquire::Check-Valid-Until True;
 APT::Get::Show-Versions True;
@@ -109,8 +110,7 @@ function cd_update_packages_catalog {
 function cd_install_package {
     if [ "${1}" ] ; then
         case "${CD_OS_NAME}" in
-            'debian') DEBIAN_FRONTEND='noninteractive' \
-                apt-get install --yes "${1}" || exit ;;
+            'debian') apt-get install --yes "${1}" || exit ;;
             *) exit 1 ;;
         esac
     fi