diff --git a/pkgs/tools/networking/network-manager/default.nix b/pkgs/tools/networking/network-manager/default.nix
index cf2821e9690..c86b59d4835 100644
--- a/pkgs/tools/networking/network-manager/default.nix
+++ b/pkgs/tools/networking/network-manager/default.nix
@@ -15,8 +15,7 @@ stdenv.mkDerivation rec {
 
   preConfigure = ''
     substituteInPlace tools/glib-mkenums --replace /usr/bin/perl ${perl}/bin/perl
-    substituteInPlace src/ppp-manager/nm-ppp-manager.c --replace /sbin/modprobe /run/current-system/sw/sbin/modprobe
-    substituteInPlace src/devices/nm-device.c --replace /sbin/modprobe /run/current-system/sw/sbin/modprobe
+    substituteInPlace src/NetworkManagerUtils.c --replace /sbin/modprobe /run/current-system/sw/sbin/modprobe
     substituteInPlace data/85-nm-unmanaged.rules \
       --replace /bin/sh ${stdenv.shell} \
       --replace /usr/sbin/ethtool ${ethtool}/sbin/ethtool \