diff --git a/phpBB/phpbb/session.php b/phpBB/phpbb/session.php
index cbe2f02851..cc200b1adc 100644
--- a/phpBB/phpbb/session.php
+++ b/phpBB/phpbb/session.php
@@ -838,7 +838,7 @@ class session
 			$sql = 'SELECT COUNT(session_id) AS sessions
 					FROM ' . SESSIONS_TABLE . '
 					WHERE session_user_id = ' . (int) $this->data['user_id'] . '
-					AND session_time >= ' . (int) ($this->time_now - (max($config['session_length'], $config['form_token_lifetime'])));
+					AND session_time >= ' . (int) ($this->time_now - (max((int) $config['session_length'], (int) $config['form_token_lifetime'])));
 			$result = $db->sql_query($sql);
 			$row = $db->sql_fetchrow($result);
 			$db->sql_freeresult($result);