diff --git a/src_app/app.php b/src_app/app.php
index 99981a8..8393376 100644
--- a/src_app/app.php
+++ b/src_app/app.php
@@ -1,6 +1,7 @@
 <?php
 namespace nur\sery;
 
+use nulib\A;
 use nulib\app\LockFile;
 use nulib\app\RunFile;
 use nulib\ExitError;