diff --git a/pkgs/desktops/xfce/core/gtk-xfce-engine.nix b/pkgs/desktops/xfce/core/gtk-xfce-engine.nix
index 0a30d8ac48b..8252548b856 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, gtk3 }:
+{ stdenv, fetchurl, pkgconfig, intltool, gtk, enableGtk3Support ? false, 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 gtk3 ];
+  buildInputs = [ pkgconfig intltool gtk ] ++ stdenv.lib.optional enableGtk3Support gtk;
 
   meta = {
     homepage = http://www.xfce.org/;