diff --git a/nixbld-etc-nixos/configuration.nix b/nixbld-etc-nixos/configuration.nix
index cbf19bb..3ef4425 100644
--- a/nixbld-etc-nixos/configuration.nix
+++ b/nixbld-etc-nixos/configuration.nix
@@ -317,7 +317,7 @@ in
     };
     children."${netifUSA}" = {
       mode = "transport";
-      ah_proposals = [ "sha256-curve25519" ];
+      esp_proposals = [ "aes256gcm128-sha256-curve25519" ];
       remote_ts = [ "5.78.86.156[gre]" ];
       local_ts = [ "94.190.212.123[gre]" ];
       start_action = "start";