diff --git a/functions.php b/functions.php
index e3054474e..8ec0755e1 100644
--- a/functions.php
+++ b/functions.php
@@ -74,6 +74,9 @@ function twentytwelve_setup() {
 	// This theme uses a custom image size for featured images, displayed on "standard" posts.
 	add_theme_support( 'post-thumbnails' );
 	set_post_thumbnail_size( 624, 9999 ); // Unlimited height, soft crop
+
+	// Indicate widget sidebars can use selective refresh in the Customizer.
+	add_theme_support( 'customize-selective-refresh-widgets' );
 }
 add_action( 'after_setup_theme', 'twentytwelve_setup' );