diff --git a/etc/inc/upgrade_config.inc b/etc/inc/upgrade_config.inc
index ef508d8ddb..3180524031 100644
--- a/etc/inc/upgrade_config.inc
+++ b/etc/inc/upgrade_config.inc
@@ -2818,6 +2818,8 @@ function upgrade_082_to_083() {
 		$config['captiveportal']['cpzone'] = array();
 		$config['captiveportal']['cpzone'] = $tmpcp;
 		$config['captiveportal']['cpzone']['zoneid'] = 8000;
+		if ($config['captiveportal']['cpzone']['auth_method'] == "radius")
+			$config['captiveportal']['cpzone']['radius_protocol'] = "PAP";
 	}
 	if (!empty($config['voucher'])) {
 		$tmpcp = $config['voucher'];