diff --git a/apps/user_ldap/lib/Access.php b/apps/user_ldap/lib/Access.php
index 5501dd3d0e..48914e6428 100644
--- a/apps/user_ldap/lib/Access.php
+++ b/apps/user_ldap/lib/Access.php
@@ -2022,7 +2022,7 @@ class Access extends LDAPUtility implements IUserTools {
 	 * @param string|string[]|null $attr
 	 * @return bool
 	 */
-	private function manyAttributes($attr) {
+	private function manyAttributes($attr): bool {
 		if (\is_array($attr)) {
 			return \count($attr) > 1;
 		}