diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-revisions-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-revisions-controller.php
index 78f6e115688b4..08a8479678002 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-revisions-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-revisions-controller.php
@@ -407,7 +407,7 @@ public function get_item( $request ) {
 			return new WP_Error(
 				'rest_post_invalid_parent',
 				/* translators: %s: A post revision id. */
-				sprintf( __( 'Parent post does not have a revision with id of "%s"' ), $revision->post_parent ),
+				sprintf( __( 'Parent post does not have a revision with id of "%s"' ), $request['id'] ),
 				array( 'status' => 404 )
 			);
 		}