diff --git a/src/wp-includes/rest-api/rest-functions.php b/src/wp-includes/rest-api/rest-functions.php
index 4dd69dd805..90bb2e7305 100644
--- a/src/wp-includes/rest-api/rest-functions.php
+++ b/src/wp-includes/rest-api/rest-functions.php
@@ -52,7 +52,7 @@ function register_rest_route( $namespace, $route, $args = array(), $override = f
 		 * and namespace indexes. If you really need to register a
 		 * non-namespaced route, call `WP_REST_Server::register_route` directly.
 		 */
-		_doing_it_wrong( 'register_rest_route', 'Routes must be namespaced with plugin name and version', 'WPAPI-2.0' );
+		_doing_it_wrong( 'register_rest_route', 'Routes must be namespaced with plugin name and version', '4.4.0' );
 
 		$full_route = '/' . trim( $route, '/' );
 	}