diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-autosaves-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-autosaves-controller.php
index 04da85b9cc..e55d3a3729 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-autosaves-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-autosaves-controller.php
@@ -244,7 +244,7 @@ class WP_REST_Autosaves_Controller extends WP_REST_Revisions_Controller {
 		$parent_id = (int) $request->get_param( 'parent' );
 
 		if ( $parent_id <= 0 ) {
-			return new WP_Error( 'rest_post_invalid_id', __( 'Invalid parent post ID.' ), array( 'status' => 404 ) );
+			return new WP_Error( 'rest_post_invalid_id', __( 'Invalid post parent ID.' ), array( 'status' => 404 ) );
 		}
 
 		$autosave = wp_get_post_autosave( $parent_id );
diff --git a/wp-includes/version.php b/wp-includes/version.php
index ca41fd523b..8b1a917949 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-alpha-45443';
+$wp_version = '5.3-alpha-45444';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.