diff --git a/src/etc/inc/interfaces.inc b/src/etc/inc/interfaces.inc
index 8f60d2dd8..68477c81c 100644
--- a/src/etc/inc/interfaces.inc
+++ b/src/etc/inc/interfaces.inc
@@ -3072,7 +3072,7 @@ function DHCP6_Config_File_Advanced($interface, $wancfg, $wanif, $id = 0)
         $key_info_statement .= "  realm \"{$wancfg['adv_dhcp6_key_info_statement_realm']}\";\n";
         $key_info_statement .= "  keyid {$wancfg['adv_dhcp6_key_info_statement_keyid']};\n";
         $key_info_statement .= "  secret \"{$wancfg['adv_dhcp6_key_info_statement_secret']}\";\n";
-        if (preg_match("/((([0-9]{4}-)?[0-9]{2}[0-9]{2} )?[0-9]{2}:[0-9]{2})||(forever)/", $wancfg['adv_dhcp6_key_info_statement_expire'])) {
+        if (preg_match("/((([0-9]{4}-)?[0-9]{2}-[0-9]{2} )?[0-9]{2}:[0-9]{2})|(forever)/", $wancfg['adv_dhcp6_key_info_statement_expire'])) {
             $key_info_statement .= "  expire \"{$wancfg['adv_dhcp6_key_info_statement_expire']}\";\n";
         }
         $key_info_statement .= "};\n";