diff --git a/wp-admin/includes/class-wp-theme-install-list-table.php b/wp-admin/includes/class-wp-theme-install-list-table.php
index 8b267656ce..8a46199f16 100644
--- a/wp-admin/includes/class-wp-theme-install-list-table.php
+++ b/wp-admin/includes/class-wp-theme-install-list-table.php
@@ -362,7 +362,7 @@ class WP_Theme_Install_List_Table extends WP_Themes_List_Table {
 	 * @uses $tab Global; current tab within Themes->Install screen
 	 * @uses $type Global; type of search.
 	 */
-	function _js_vars() {
+	function _js_vars( $extra_args = array() ) {
 		global $tab, $type;
 		parent::_js_vars( compact( 'tab', 'type' ) );
 	}