diff --git a/pkgs/applications/audio/amarok/default.nix b/pkgs/applications/audio/amarok/default.nix
index f45ca59e0ea0..1dac3f6b853a 100644
--- a/pkgs/applications/audio/amarok/default.nix
+++ b/pkgs/applications/audio/amarok/default.nix
@@ -1,7 +1,7 @@
 { stdenv, fetchurl, lib, qtscriptgenerator, perl, gettext, curl
 , libxml2, mysql, taglib, taglib_extras, loudmouth , kdelibs
 , qca2, libmtp, liblastfm, libgpod, pkgconfig, automoc4, phonon
-, strigi, soprano, qjson, ffmpeg, libofa, nepomuk_core }:
+, strigi, soprano, qjson, ffmpeg, libofa, nepomuk_core ? null }:
 
 stdenv.mkDerivation rec {
   name = "${pname}-${version}";