diff --git a/manual/deploy/notification-server.md b/manual/deploy/notification-server.md
index 0aebbb89..eee28bb0 100644
--- a/manual/deploy/notification-server.md
+++ b/manual/deploy/notification-server.md
@@ -60,7 +60,7 @@ server {
         proxy_pass http://127.0.0.1:8083/;
         proxy_http_version 1.1;
         proxy_set_header Upgrade $http_upgrade;
-        proxy_set_header Connection "upgrade";
+        proxy_set_header Connection $connection_upgrade;
         access_log      /var/log/nginx/notif.access.log;
         error_log       /var/log/nginx/notif.error.log;
     }