diff --git a/README.md b/README.md
index c9cd2a5..acda916 100644
--- a/README.md
+++ b/README.md
@@ -219,7 +219,7 @@ proxy_set_header Connection $proxy_connection;
 proxy_set_header X-Real-IP $remote_addr;
 proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
 proxy_set_header X-Forwarded-Proto $proxy_x_forwarded_proto;
-proxy_set_header X-Forwarded-Port $server_port;
+proxy_set_header X-Forwarded-Port $proxy_x_forwarded_port;
 
 # Mitigate httpoxy attack (see README for details)
 proxy_set_header Proxy "";