diff --git a/mastodon-container.nix b/mastodon-container.nix
index 2996963..07223ad 100644
--- a/mastodon-container.nix
+++ b/mastodon-container.nix
@@ -86,7 +86,7 @@ let
           proxy_redirect off;
           proxy_http_version 1.1;
           proxy_set_header Upgrade $http_upgrade;
-          proxy_set_header Connection $connection_upgrade;
+          proxy_set_header Connection "upgrade";
           tcp_nodelay on;
         }
       }