diff --git a/src/server/UnconnectedMessageHandler.php b/src/server/UnconnectedMessageHandler.php
index 73625fa..4219a57 100644
--- a/src/server/UnconnectedMessageHandler.php
+++ b/src/server/UnconnectedMessageHandler.php
@@ -30,6 +30,7 @@
 use raklib\protocol\UnconnectedPingOpenConnections;
 use raklib\protocol\UnconnectedPong;
 use raklib\utils\InternetAddress;
+use raklib\utils\Cookie;
 use function get_class;
 use function min;
 use function ord;