diff --git a/src/AbstractSession.php b/src/AbstractSession.php
index b615e73..6205629 100644
--- a/src/AbstractSession.php
+++ b/src/AbstractSession.php
@@ -2,6 +2,7 @@
 
 namespace Thruway;
 
+use function React\Promise\Timer\timeout;
 use Thruway\Message\AbortMessage;
 use Thruway\Message\Message;