diff --git a/install.php b/install.php
index 1732aa94..e8bdda8b 100644
--- a/install.php
+++ b/install.php
@@ -1,7 +1,7 @@
 <?php
 
 // Installation/upgrade file	
-define('VERSION', 'v0.9.6-dev-17');
+define('VERSION', 'v0.9.6-dev-18');
 
 require 'inc/functions.php';
 
@@ -388,6 +388,10 @@ if (file_exists($config['has_installed'])) {
 			}
 		case 'v0.9.6-dev-16':
 			query("ALTER TABLE ``bans`` ADD INDEX `seen` (`seen`)") or error(db_error());
+		case 'v0.9.6-dev-17':
+			query("ALTER TABLE ``ip_notes``
+				DROP INDEX `ip`,
+				ADD INDEX `ip_lookup` (`ip`, `time`)") or error(db_error());
 		case false:
 			// Update version number
 			file_write($config['has_installed'], VERSION);
diff --git a/install.sql b/install.sql
index 2978b5c3..a3c03cb1 100644
--- a/install.sql
+++ b/install.sql
@@ -101,7 +101,7 @@ CREATE TABLE IF NOT EXISTS `ip_notes` (
   `time` int(11) NOT NULL,
   `body` text NOT NULL,
   UNIQUE KEY `id` (`id`),
-  KEY `ip` (`ip`)
+  KEY `ip_lookup` (`ip`, `time`)
 ) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 AUTO_INCREMENT=1 ;
 
 -- --------------------------------------------------------