diff --git a/lib/authelia.sh b/lib/authelia.sh
index 118a44a..ba8008f 100644
--- a/lib/authelia.sh
+++ b/lib/authelia.sh
@@ -75,6 +75,11 @@ AUTHELIA_AUTHENTICATION_BACKEND_LDAP_PASSWORD_FILE=/secrets/AUTHENTICATION_BACKE
 EOF
 chmod 600 /federated/apps/authelia/.env
 
+# Set the ldap configuration up for subdomain if we need to
+if [ "${#LDAP_DOMAIN_ARRAY[@]}" -eq "3" ]; then
+  sed -i "s#dc=$LDAP_DOMAIN_FIRST,dc=$LDAP_DOMAIN_LAST#dc=$LDAP_DOMAIN_FIRST,dc=$LDAP_DOMAIN_MIDDLE,dc=$LDAP_DOMAIN_LAST#g" /federated/apps/authelia/.env
+fi
+
 cat > /federated/apps/authelia/data/config/configuration.yml <<EOF
 ---
 theme: auto