diff --git a/src/wp-admin/js/theme.js b/src/wp-admin/js/theme.js
index ac5e51d907..9442f7feeb 100644
--- a/src/wp-admin/js/theme.js
+++ b/src/wp-admin/js/theme.js
@@ -610,6 +610,7 @@ themes.view.Search = wp.Backbone.View.extend({
 
 	tagName: 'input',
 	className: 'theme-search',
+	id: 'theme-search-input',
 
 	attributes: {
 		placeholder: l10n.searchPlaceholder,