diff --git a/wp-includes/nav-menu-template.php b/wp-includes/nav-menu-template.php
index 80c0454e2a..bcc9b6325c 100644
--- a/wp-includes/nav-menu-template.php
+++ b/wp-includes/nav-menu-template.php
@@ -230,11 +230,6 @@ function wp_nav_menu( $args = array() ) {
'echo' => true, 'fallback_cb' => 'wp_page_menu', 'before' => '', 'after' => '', 'link_before' => '', 'link_after' => '', 'items_wrap' => '
',
'depth' => 0, 'walker' => '', 'theme_location' => '' );
- // Prevent a fallback_cb in Customizer Preview to assist with has_nav_menu() and partial refresh.
- if ( is_customize_preview() ) {
- $defaults['fallback_cb'] = '';
- }
-
$args = wp_parse_args( $args, $defaults );
/**
* Filter the arguments used to display a navigation menu.
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 6c8aa3331d..4e2e30cb08 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
*
* @global string $wp_version
*/
-$wp_version = '4.3-RC2-33584';
+$wp_version = '4.3-RC2-33585';
/**
* Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.