diff --git a/nixos/modules/services/x11/desktop-managers/xfce.nix b/nixos/modules/services/x11/desktop-managers/xfce.nix
index 5e5fab3ed2bb..3c67571ffd5b 100644
--- a/nixos/modules/services/x11/desktop-managers/xfce.nix
+++ b/nixos/modules/services/x11/desktop-managers/xfce.nix
@@ -29,7 +29,7 @@ in
         start =
           ''
             # Set GTK_PATH so that GTK+ can find the theme engines.
-            export GTK_PATH=${config.system.path}/lib/gtk-2.0
+            export GTK_PATH="${config.system.path}/lib/gtk-2.0:${config.system.path}/lib/gtk-3.0"
 
             # Set GTK_DATA_PREFIX so that GTK+ can find the Xfce themes.
             export GTK_DATA_PREFIX=${config.system.path}
diff --git a/pkgs/desktops/xfce/core/gtk-xfce-engine.nix b/pkgs/desktops/xfce/core/gtk-xfce-engine.nix
index a97a11c6f123..0a30d8ac48b5 100644
--- a/pkgs/desktops/xfce/core/gtk-xfce-engine.nix
+++ b/pkgs/desktops/xfce/core/gtk-xfce-engine.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, pkgconfig, intltool, gtk }:
+{ stdenv, fetchurl, pkgconfig, intltool, gtk, gtk3 }:
 
 stdenv.mkDerivation rec {
   p_name  = "gtk-xfce-engine";
@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
   name = "${p_name}-${ver_maj}.${ver_min}";
 
   #TODO: gtk3
-  buildInputs = [ pkgconfig intltool gtk ];
+  buildInputs = [ pkgconfig intltool gtk gtk3 ];
 
   meta = {
     homepage = http://www.xfce.org/;