diff --git a/modules/nginx-port-forward/default.nix b/modules/nginx-port-forward/default.nix
index 014543f..7d6e2f3 100644
--- a/modules/nginx-port-forward/default.nix
+++ b/modules/nginx-port-forward/default.nix
@@ -20,7 +20,9 @@ let
         ${ optionalString (sslDhparam != null) "ssl_dhparam ${sslDhparam};" }
       '' }
 
-      proxy_pass ${forward.host}:${toString forward.port};
+      set $upstream_server ${forward.host}:${toString forward.port};
+
+      proxy_pass $upstream_server;
     }
   '';