diff --git a/setup.sh b/setup.sh
index 1868453..e1b4f36 100644
--- a/setup.sh
+++ b/setup.sh
@@ -126,32 +126,22 @@ configure_ssh() {
     printf \"%s\n\" \"$SSH_KEY\" > \"/home/$USERNAME/.ssh/authorized_keys\"
     chmod 600 \"/home/$USERNAME/.ssh/authorized_keys\"
     chown -R \"$USERNAME\":\"$USERNAME\" \"/home/$USERNAME/.ssh\"
-    if ! grep -qE \"^[[:space:]]*Include[[:space:]]+/etc/ssh/sshd_config.d/\\*.conf\" /etc/ssh/sshd_config; then
-      echo \"Include /etc/ssh/sshd_config.d/*.conf\" >> /etc/ssh/sshd_config
+    if ! grep -qE '^[[:space:]]*Include[[:space:]]+/etc/ssh/sshd_config.d/\*.conf' /etc/ssh/sshd_config; then
+      sed -i '1iInclude /etc/ssh/sshd_config.d/*.conf' /etc/ssh/sshd_config
     fi
     install -d -m 755 /etc/ssh/sshd_config.d
     dir=/etc/ssh/sshd_config.d
     shopt -s nullglob
     for f in \"\$dir\"/*.conf; do
       base=\$(basename \"\$f\")
-      case \"\$base\" in
-        [0-9][0-9]-*.conf)
-          [[ \$base == 99-* ]] && mv \"\$f\" \"\${f%.conf}.disabled\"
-          ;;
-        *)
-          mv \"\$f\" \"\${f%.conf}.disabled\"
-          ;;
-      esac
+      if [[ \$base == 00-* ]]; then
+        mv \"\$f\" \"\$dir/01-\$base\"
+      elif [[ \$base != [0-9][0-9]-* ]]; then
+        mv \"\$f\" \"\${f%.conf}.disabled\"
+      fi
     done
     shopt -u nullglob
-    max=\$(find \"\$dir\" -maxdepth 1 -type f -name '[0-9][0-9]-*.conf' | sed -n 's#.*/\\([0-9][0-9]\\)-.*#\\1#p' | sort -n | tail -1)
-    if [ -z \"\$max\" ]; then
-      next=10
-    else
-      next=\$((10#\$max + 10))
-      [ \"\$next\" -gt 99 ] && next=99
-    fi
-    newfile=\$(printf '%s/%02d-hardening.conf' \"\$dir\" \"\$next\")
+    newfile=\"\$dir/00-hardening.conf\"
     printf \"%s\n\" 'PasswordAuthentication no' 'PermitRootLogin no' 'KbdInteractiveAuthentication no' > \"\$newfile\"
     chown root:root \"\$newfile\"
     chmod 0644 \"\$newfile\"