diff --git a/docs/SERVER.md b/docs/SERVER.md
index e5359d05a8..dc18a76f4c 100644
--- a/docs/SERVER.md
+++ b/docs/SERVER.md
@@ -42,7 +42,7 @@ Manual installation requires some preliminary actions:
 
    ```sh
    # For Ubuntu
-   ufw allow 5233
+   ufw allow 5223
    ```
 
 4. **Optional** — If you're using distribution with `systemd`, create `/etc/systemd/system/smp-server.service` file with the following content: