diff --git a/README.md b/README.md
index 53e8d5d..dddea56 100644
--- a/README.md
+++ b/README.md
@@ -205,6 +205,7 @@ 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;
 
 # Mitigate httpoxy attack (see README for details)
 proxy_set_header Proxy "";
diff --git a/nginx.tmpl b/nginx.tmpl
index 0969564..b168bc5 100644
--- a/nginx.tmpl
+++ b/nginx.tmpl
@@ -51,6 +51,7 @@ 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;
 
 # Mitigate httpoxy attack (see README for details)
 proxy_set_header Proxy "";