diff --git a/wp-admin/plugins.php b/wp-admin/plugins.php
index 50b5aac58..12556660f 100644
--- a/wp-admin/plugins.php
+++ b/wp-admin/plugins.php
@@ -167,6 +167,7 @@ if( !empty($action) ) {
 
 wp_enqueue_script('admin-forms');
 wp_enqueue_script('plugin-install');
+add_thickbox();
 
 $title = __('Manage Plugins');
 require_once('admin-header.php');