diff --git a/pkgs/tools/X11/caffeine-ng/default.nix b/pkgs/tools/X11/caffeine-ng/default.nix
index 93f180df52be..090f8015f494 100644
--- a/pkgs/tools/X11/caffeine-ng/default.nix
+++ b/pkgs/tools/X11/caffeine-ng/default.nix
@@ -1,19 +1,19 @@
 { gdk-pixbuf, glib, gobject-introspection, gtk3, lib, libnotify,
-  pythonPackages, wrapGAppsHook
+  python3Packages, wrapGAppsHook
 }:
 
-pythonPackages.buildPythonApplication rec {
+python3Packages.buildPythonApplication rec {
   pname = "caffeine-ng";
   version = "3.4.2";
 
-  src = pythonPackages.fetchPypi{
+  src = python3Packages.fetchPypi{
     inherit pname version;
     sha256="05k8smjlfjcccgmp8qi04l7106k46fs4p8fl5bdqqjwv6pwl7y4w";
   };
 
   nativeBuildInputs = [ wrapGAppsHook glib ];
   buildInputs = [ gdk-pixbuf gobject-introspection libnotify gtk3 ];
-  pythonPath = with pythonPackages; [
+  pythonPath = with python3Packages; [
     dbus-python docopt ewmh pygobject3 pyxdg
     setproctitle setuptools setuptools_scm wheel
   ];