diff --git a/classes/task/cleanup_oidc_state_and_token.php b/classes/task/cleanup_oidc_state_and_token.php
index e08d8dc..0007c6d 100644
--- a/classes/task/cleanup_oidc_state_and_token.php
+++ b/classes/task/cleanup_oidc_state_and_token.php
@@ -44,7 +44,7 @@ public function execute() {
         global $DB;
 
         // Clean up oidc state.
-        $DB->delete_records_select('auth_oidc_state', 'timecreated < ?', strtotime('-5 min'));
+        $DB->delete_records_select('auth_oidc_state', 'timecreated < ?', array(strtotime('-5 min')));
 
         // Clean up invalid oidc token.
         $DB->delete_records('auth_oidc_token', ['userid' => 0]);