diff --git a/pkgs/tools/networking/xl2tpd/default.nix b/pkgs/tools/networking/xl2tpd/default.nix
index 50b341778eee..4b8f91461d80 100644
--- a/pkgs/tools/networking/xl2tpd/default.nix
+++ b/pkgs/tools/networking/xl2tpd/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, libpcap }:
+{ stdenv, fetchFromGitHub, libpcap, ppp }:
 
 let version = "1.3.6";
 in stdenv.mkDerivation {
@@ -13,6 +13,10 @@ in stdenv.mkDerivation {
 
   buildInputs = [ libpcap ];
 
+  postPatch = ''
+    substituteInPlace l2tp.h --replace /usr/sbin/pppd ${ppp}/sbin/pppd
+  '';
+
   makeFlags = [ "PREFIX=$(out)" ];
 
   meta = with stdenv.lib; {