diff --git a/nixos/modules/services/networking/xl2tpd.nix b/nixos/modules/services/networking/xl2tpd.nix
index fd234cec03a6..21b70c9f16ac 100644
--- a/nixos/modules/services/networking/xl2tpd.nix
+++ b/nixos/modules/services/networking/xl2tpd.nix
@@ -89,9 +89,8 @@ with lib;
 
         xl2tpd-ppp-wrapped = pkgs.stdenv.mkDerivation {
           name = "xl2tpd-ppp-wrapped";
-          phases = [ "installPhase" ];
           nativeBuildInputs = with pkgs; [ makeWrapper ];
-          installPhase = ''
+          buildCommand = ''
             mkdir -p $out/bin
 
             makeWrapper ${pkgs.ppp}/sbin/pppd $out/bin/pppd \