diff --git a/makefiles/in_chroot/install.sh b/makefiles/in_chroot/install.sh
index 26c7cbcd..46405274 100755
--- a/makefiles/in_chroot/install.sh
+++ b/makefiles/in_chroot/install.sh
@@ -34,12 +34,17 @@ if ! [ -d /home/$USERNAME ]; then
 fi
 
 # add empty ~/.ssh/authorized_keys (see #80)
-SSH_AUTHORIZED_KEYS=/home/$USERNAME/.ssh/authorized_keys
-mkdir -p -m 700 $(dirname $SSH_AUTHORIZED_KEYS)
-chown $USERNAME:users $(dirname $SSH_AUTHORIZED_KEYS)
-touch $SSH_AUTHORIZED_KEYS
-chown $USERNAME:users $SSH_AUTHORIZED_KEYS
-chmod 600 $SSH_AUTHORIZED_KEYS
+function add_authorized_keys_file() {
+    SSH_AUTHORIZED_KEYS=/home/$1/.ssh/authorized_keys
+    mkdir -p -m 700 $(dirname $SSH_AUTHORIZED_KEYS)
+    chown $1:users $(dirname $SSH_AUTHORIZED_KEYS)
+    touch $SSH_AUTHORIZED_KEYS
+    chown $1:users $SSH_AUTHORIZED_KEYS
+    chmod 600 $SSH_AUTHORIZED_KEYS
+}
+
+add_authorized_keys_file $USERNAME
+add_authorized_keys_file "root"
 
 # remove default arch linux arm user
 userdel -r -f alarm || true