diff --git a/Webserver-Reverse-Proxy.md b/Webserver-Reverse-Proxy.md
index d36809f..dd9f130 100644
--- a/Webserver-Reverse-Proxy.md
+++ b/Webserver-Reverse-Proxy.md
@@ -16,7 +16,7 @@ server {
     proxy_pass         http://localhost:3001/;
     proxy_http_version 1.1;
     proxy_set_header   Upgrade $http_upgrade;
-    proxy_set_header   Connection $connection_upgrade;
+    proxy_set_header   Connection "upgrade";
   }
 }
 ```