diff --git a/src/wp-includes/locale.php b/src/wp-includes/locale.php
index b30d1fdf42..6a459e3e34 100644
--- a/src/wp-includes/locale.php
+++ b/src/wp-includes/locale.php
@@ -8,20 +8,3 @@
  */
 
 _deprecated_file( basename( __FILE__ ), '4.7.0' );
-
-/** WP_Locale class */
-require_once ABSPATH . WPINC . '/class-wp-locale.php';
-
-/**
- * Checks if current locale is RTL.
- *
- * @since 3.0.0
- *
- * @global WP_Locale $wp_locale
- *
- * @return bool Whether locale is RTL.
- */
-function is_rtl() {
-	global $wp_locale;
-	return $wp_locale->is_rtl();
-}