diff --git a/containers/docker-compose.yaml b/containers/docker-compose.yaml
index 26ce853..50bc23a 100644
--- a/containers/docker-compose.yaml
+++ b/containers/docker-compose.yaml
@@ -16,9 +16,10 @@ services:
       # port for wireguard-ui. this must be set here as the `wireguard-ui` container joins the network of this container and hasn't its own network over which it could publish the ports
       - "5000:5000"
       # port of the wireguard server
-      - "51820:51820/udp"
+      - "51821:51821/udp"
     environment:
       - PEERS
+      - SERVERPORT=51821
 
   wireguard-ui:
     image: ngoduykhanh/wireguard-ui:latest