diff --git a/wp-includes/class-wp-editor.php b/wp-includes/class-wp-editor.php
index 73de84de2b..da39c96de1 100644
--- a/wp-includes/class-wp-editor.php
+++ b/wp-includes/class-wp-editor.php
@@ -826,6 +826,10 @@ final class _WP_Editors {
 		$settings['indent'] = true;
 		$settings['elementpath'] = false;
 
+		if ( is_rtl() ) {
+			$settings['directionality'] = 'rtl';
+		}
+
 		// In production all plugins are loaded (they are in wp-editor.js.gz)
 		// but only these will be initialized by default.
 		$settings['plugins'] = implode( ',', array(
diff --git a/wp-includes/version.php b/wp-includes/version.php
index cc0cf154e4..10c0458bef 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.9-alpha-40926';
+$wp_version = '4.9-alpha-40927';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.