diff --git a/pkgs/applications/science/electronics/picoscope/default.nix b/pkgs/applications/science/electronics/picoscope/default.nix
index 596f220242bb..c7242117b68c 100644
--- a/pkgs/applications/science/electronics/picoscope/default.nix
+++ b/pkgs/applications/science/electronics/picoscope/default.nix
@@ -1,5 +1,5 @@
 { stdenv, lib, fetchurl, dpkg, makeWrapper , mono, gtk-sharp-3_0
-, glib, libusb1 , zlib, gtk3-x11, callPackage
+, glib, libusb1 , zlib, gtk3-x11, callPackage, writeTextDir
 , scopes ? [
   "picocv"
   "ps2000"
@@ -114,7 +114,7 @@ in stdenv.mkDerivation rec {
   # services.udev.packages = [ pkgs.picoscope.rules ];
   # users.groups.pico = {};
   # users.users.you.extraGroups = [ "pico" ];
-  passthru.rules = lib.writeTextDir "lib/udev/rules.d/95-pico.rules" ''
+  passthru.rules = writeTextDir "lib/udev/rules.d/95-pico.rules" ''
     SUBSYSTEMS=="usb", ATTRS{idVendor}=="0ce9", MODE="664",GROUP="pico"
   '';