diff --git a/src/wp-admin/js/theme.js b/src/wp-admin/js/theme.js
index 0e83f4e04b..b114e36a1f 100644
--- a/src/wp-admin/js/theme.js
+++ b/src/wp-admin/js/theme.js
@@ -454,6 +454,8 @@ themes.view.Theme = wp.Backbone.View.extend({
 		var self = this,
 			current, preview;
 
+		event = event || window.event;
+
 		// Bail if the user scrolled on a touch device
 		if ( this.touchDrag === true ) {
 			return this.touchDrag = false;
@@ -1658,6 +1660,9 @@ themes.RunInstaller = {
 		themes.router.on( 'route:preview', function( slug ) {
 			request.theme = slug;
 			self.view.collection.query( request );
+			self.view.collection.once( 'update', function() {
+				self.view.view.theme.preview();
+			});
 		});
 
 		// Handles sorting / browsing routes