diff --git a/atf.inc.php b/atf.inc.php
index 879455e..e420b20 100644
--- a/atf.inc.php
+++ b/atf.inc.php
@@ -2,6 +2,7 @@
 namespace taskman;
 use Amp;
 use ClickHouseDB;
+use Exception;
 
 interface IATFDevicePool
 {