diff --git a/README.md b/README.md
index ee7f2be..21ceefc 100644
--- a/README.md
+++ b/README.md
@@ -72,6 +72,8 @@ Password for SMTP authentication.
 Ldap host.
 
 ## LDAP_PORT
+- default: 389
+
 Ldap port.
 
 ## LDAP_TLS
diff --git a/rootfs/etc/cont-init.d/00-nextcloud b/rootfs/etc/cont-init.d/00-nextcloud
index 274e5ea..7a69aed 100644
--- a/rootfs/etc/cont-init.d/00-nextcloud
+++ b/rootfs/etc/cont-init.d/00-nextcloud
@@ -46,6 +46,6 @@ if [ $? -ne 1 ]; then
     s6-setuidgid nginx ./occ config:app:set --value "$LDAP_BIND_PASSWORD" user_ldap ldap_agent_password
     s6-setuidgid nginx ./occ config:app:set --value "$LDAP_GROUP_FILTER" user_ldap ldap_group_filter
     s6-setuidgid nginx ./occ config:app:set --value "$LDAP_USER_DISPLAY_NAME" user_ldap ldap_display_name
-    s6-setuidgid nginx ./occ config:app:set --value "$LDAP_PORT" user_ldap ldap_port
+    s6-setuidgid nginx ./occ config:app:set --value "${LDAP_PORT:-389}" user_ldap ldap_port
     s6-setuidgid nginx ./occ config:app:set --value "$LDAP_BASE_USER_DN" user_ldap ldap_base_users
 fi