diff --git a/setup.sh b/setup.sh
index 3fb5b03..6427078 100644
--- a/setup.sh
+++ b/setup.sh
@@ -126,32 +126,25 @@ 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 '/^[[:space:]]*Include[[:space:]]*\/etc\/ssh\/sshd_config.d\/\*.conf/d' /etc/ssh/sshd_config
+      echo 'Include /etc/ssh/sshd_config.d/*.conf' >> /etc/ssh/sshd_config
+    else
+      sed -i '1i Include /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 == 00-* ]] && 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
-    min=\$(find "\$dir" -maxdepth 1 -type f -name '[0-9][0-9]-*.conf' | sed -n 's#.*/\([0-9][0-9]\)-.*#\1#p' | sort -n | head -1)
-    if [ -z "\$min" ]; then
-      next=0
-    else
-      next=\$((10#\$min - 10))
-      [ "\$next" -lt 0 ] && next=0
-    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\"