diff --git a/install.php b/install.php
index d60e5aab..1732aa94 100644
--- a/install.php
+++ b/install.php
@@ -1,7 +1,7 @@
 <?php
 
 // Installation/upgrade file	
-define('VERSION', 'v0.9.6-dev-16');
+define('VERSION', 'v0.9.6-dev-17');
 
 require 'inc/functions.php';
 
@@ -386,6 +386,8 @@ if (file_exists($config['has_installed'])) {
 				query(sprintf("ALTER TABLE  ``posts_%s``
 					ADD INDEX `list_threads` (`thread`, `sticky`, `bump`)", $board['uri'])) or error(db_error());
 			}
+		case 'v0.9.6-dev-16':
+			query("ALTER TABLE ``bans`` ADD INDEX `seen` (`seen`)") or error(db_error());
 		case false:
 			// Update version number
 			file_write($config['has_installed'], VERSION);
diff --git a/install.sql b/install.sql
index 1980f8bb..2978b5c3 100644
--- a/install.sql
+++ b/install.sql
@@ -49,7 +49,8 @@ CREATE TABLE IF NOT EXISTS `bans` (
   `board` varchar(58) CHARACTER SET utf8 DEFAULT NULL,
   `seen` tinyint(1) NOT NULL,
   PRIMARY KEY (`id`),
-  KEY `ip` (`ip`)
+  KEY `ip` (`ip`),
+  KEY `seen` (`seen`)
 ) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 AUTO_INCREMENT=1 ;
 
 -- --------------------------------------------------------