diff --git a/docker/gate/Dockerfile b/docker/gate/Dockerfile
index f5a13909..0de40b3a 100644
--- a/docker/gate/Dockerfile
+++ b/docker/gate/Dockerfile
@@ -1,6 +1,7 @@
 FROM ubuntu:18.04
 
 EXPOSE 22222/udp
+EXPOSE 23333/udp
 EXPOSE 33333/tcp
 
 WORKDIR /gate