diff --git a/lib/private/DB/Adapter.php b/lib/private/DB/Adapter.php
index b6f098b1e59..71824bda9e8 100644
--- a/lib/private/DB/Adapter.php
+++ b/lib/private/DB/Adapter.php
@@ -78,7 +78,7 @@ class Adapter {
 	 * @throws Exception
 	 * @deprecated 15.0.0 - use unique index and "try { $db->insert() } catch (UniqueConstraintViolationException $e) {}" instead, because it is more reliable and does not have the risk for deadlocks - see https://github.com/nextcloud/server/pull/12371
 	 */
-	public function insertIfNotExist(string $table, array $input, ?array $compare = null): int {
+	public function insertIfNotExist($table, $input, ?array $compare = null) {
 		$compare = $compare ?: array_keys($input);
 
 		// Prepare column names and generate placeholders