diff --git a/nixos/modules/services/networking/pptpd.nix b/nixos/modules/services/networking/pptpd.nix
index a065709efe64..9adf9f58a206 100644
--- a/nixos/modules/services/networking/pptpd.nix
+++ b/nixos/modules/services/networking/pptpd.nix
@@ -87,9 +87,8 @@ with lib;
 
         ppp-pptpd-wrapped = pkgs.stdenv.mkDerivation {
           name = "ppp-pptpd-wrapped";
-          phases = [ "installPhase" ];
           nativeBuildInputs = with pkgs; [ makeWrapper ];
-          installPhase = ''
+          buildCommand = ''
             mkdir -p $out/bin
             makeWrapper ${pkgs.ppp}/bin/pppd $out/bin/pppd \
               --set LD_PRELOAD    "${pkgs.libredirect}/lib/libredirect.so" \