diff --git a/pkgs/tools/networking/network-manager/0.9.8/default.nix b/pkgs/tools/networking/network-manager/0.9.8/default.nix
index 4fad1ca2ab9a..0c791631daa4 100644
--- a/pkgs/tools/networking/network-manager/0.9.8/default.nix
+++ b/pkgs/tools/networking/network-manager/0.9.8/default.nix
@@ -1,6 +1,6 @@
 { stdenv, fetchurl, intltool, pkgconfig, dbus_glib
 , udev, libnl, libuuid, gnutls, dhcp
-, libgcrypt, perl, libgudev }:
+, libgcrypt, perl, libgudev, avahi, ppp, kmod }:
 
 stdenv.mkDerivation rec {
   name = "network-manager-${version}";
@@ -13,6 +13,12 @@ stdenv.mkDerivation rec {
 
   preConfigure = ''
     substituteInPlace tools/glib-mkenums --replace /usr/bin/perl ${perl}/bin/perl
+    substituteInPlace src/nm-device.c \
+      --replace @avahi@ ${avahi} \
+      --replace @kmod@ ${kmod}
+    substituteInPlace src/ppp-manager/nm-ppp-manager.c \
+      --replace @ppp@ ${ppp} \
+      --replace @kmod@ ${kmod}
   '';
 
   # Right now we hardcode quite a few paths at build time. Probably we should
diff --git a/pkgs/tools/networking/network-manager/0.9.8/nixos-purity.patch b/pkgs/tools/networking/network-manager/0.9.8/nixos-purity.patch
index 831b2010fcfc..9ebc080ba96f 100644
--- a/pkgs/tools/networking/network-manager/0.9.8/nixos-purity.patch
+++ b/pkgs/tools/networking/network-manager/0.9.8/nixos-purity.patch
@@ -47,7 +47,7 @@ index 1dc94ee..e60f3c8 100644
  
  	for (iter = modules; *iter; iter++) {
 -		char *argv[3] = { "/sbin/modprobe", *iter, NULL };
-+		char *argv[3] = { "/var/run/current-system/sw/bin/modprobe", *iter, NULL };
++		char *argv[3] = { "@kmod@/bin/modprobe", *iter, NULL };
  		char *envp[1] = { NULL };
  		GError *error = NULL;
  
@@ -71,7 +71,7 @@ index 59698c3..7dba0f7 100644
  	/* Make sure /dev/ppp exists (bgo #533064) */
  	if (stat ("/dev/ppp", &st) || !S_ISCHR (st.st_mode))
 -		ignored = system ("/sbin/modprobe ppp_generic");
-+		ignored = system ("/var/run/current-system/sw/bin/modprobe ppp_generic");
++		ignored = system ("@kmod@/bin/modprobe ppp_generic");
  
  	connection = nm_act_request_get_connection (req);
  	g_assert (connection);