diff --git a/admin/history.php b/admin/history.php
index d4be0a69e..075ad9236 100644
--- a/admin/history.php
+++ b/admin/history.php
@@ -39,7 +39,7 @@ $display_thumbnails = array('no_display_thumbnail' => l10n('No display'),
 
 check_status(ACCESS_ADMINISTRATOR);
 
-check_input_parameter('filter_ip', $_GET, false, '/^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/');
+check_input_parameter('filter_ip', $_GET, false, '/^[0-9.]+$/');
 check_input_parameter('filter_image_id', $_GET, false, '/^\d+$/');
 check_input_parameter('filter_user_id', $_GET, false, '/^\d+$/');