diff --git a/setup.sh b/setup.sh
index dd052e8..e1b4f36 100644
--- a/setup.sh
+++ b/setup.sh
@@ -126,8 +126,8 @@ 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