diff --git a/wp-includes/post-template.php b/wp-includes/post-template.php
index 00613118a9..185af0eed0 100644
--- a/wp-includes/post-template.php
+++ b/wp-includes/post-template.php
@@ -500,8 +500,10 @@ function get_body_class( $class = '' ) {
 	if ( is_user_logged_in() )
 		$classes[] = 'logged-in';
 
-	if ( is_admin_bar_showing() )
+	if ( is_admin_bar_showing() ) {
 		$classes[] = 'admin-bar';
+		$classes[] = 'no-customize-support';
+	}
 
 	if ( get_theme_mod( 'background_color' ) || get_background_image() )
 		$classes[] = 'custom-background';