diff --git a/src/wp-includes/class-wp-customize-nav-menus.php b/src/wp-includes/class-wp-customize-nav-menus.php
index 2b667cec86..1d78e2f63c 100644
--- a/src/wp-includes/class-wp-customize-nav-menus.php
+++ b/src/wp-includes/class-wp-customize-nav-menus.php
@@ -934,7 +934,7 @@ final class WP_Customize_Nav_Menus {
 			'renderQueryVar'        => self::RENDER_QUERY_VAR,
 			'renderNonceValue'      => wp_create_nonce( self::RENDER_AJAX_ACTION ),
 			'renderNoncePostKey'    => self::RENDER_NONCE_POST_KEY,
-			'requestUri'            => '/',
+			'requestUri'            => empty( $_SERVER['REQUEST_URI'] ) ? home_url( '/' ) : esc_url_raw( wp_unslash( $_SERVER['REQUEST_URI'] ) ),
 			'theme'                 => array(
 				'stylesheet' => $this->manager->get_stylesheet(),
 				'active'     => $this->manager->is_theme_active(),
@@ -943,10 +943,6 @@ final class WP_Customize_Nav_Menus {
 			'navMenuInstanceArgs'   => $this->preview_nav_menu_instance_args,
 		);
 
-		if ( ! empty( $_SERVER['REQUEST_URI'] ) ) {
-			$exports['requestUri'] = esc_url_raw( home_url( wp_unslash( $_SERVER['REQUEST_URI'] ) ) );
-		}
-
 		printf( '<script>var _wpCustomizePreviewNavMenusExports = %s;</script>', wp_json_encode( $exports ) );
 	}