diff --git a/ynh-dev b/ynh-dev
index 9201542..5217458 100755
--- a/ynh-dev
+++ b/ynh-dev
@@ -226,7 +226,7 @@ function rebuild_ynhdev()
     set -x
     sudo lxc info $BOX-rebuild >/dev/null && sudo lxc delete $BOX-rebuild --force
     if [[ ${ARCH} eq "armhf" ]]
-        sudo apt install debootstrap
+        sudo apt install debootstrap -y
         sudo mkdir -p ~/lxc-images/debian-$DIST
         sudo debootstrap $DIST ~/lxc-images/debian-$DIST
         sudo tar -cvzf rootfs.tar.gz -C ~/lxc-images/debian-$DIST