diff --git a/radicale3_auth_ldap/__init__.py b/radicale3_auth_ldap/__init__.py
index 548e4bf..ecc399c 100644
--- a/radicale3_auth_ldap/__init__.py
+++ b/radicale3_auth_ldap/__init__.py
@@ -76,7 +76,7 @@ class Auth(BaseAuth):
         SUPPORT_EXTENDED = self.configuration.get("auth", "ldap_support_extended")
         
         try:
-            conn = ldap3.Connection(server, f'cn={user},ou=users,DC=ldap,DC=goauthentik,DC=io', password, client_strategy=SAFE_SYNC, auto_bind=True)
+            conn = ldap3.Connection(SERVER, f'cn={user},ou=users,DC=ldap,DC=goauthentik,DC=io', password, client_strategy=SAFE_SYNC, auto_bind=True)
             return user
         except Exception as err:
             logger.debug("LDAP error: %s" % err)