diff --git a/pkgs/tools/system/bootchart/default.nix b/pkgs/tools/system/bootchart/default.nix
index b5f1af6dfeda..34da8d400811 100644
--- a/pkgs/tools/system/bootchart/default.nix
+++ b/pkgs/tools/system/bootchart/default.nix
@@ -1,4 +1,4 @@
-{stdenv, fetchurl, lib, pkgconfig, glib, gtk2, python27, pythonPackages }:
+{stdenv, fetchurl, lib, pkgconfig, glib, gtk2, python27, python2Packages }:
 
 stdenv.mkDerivation rec {
   version = "0.14.7";
@@ -9,11 +9,11 @@ stdenv.mkDerivation rec {
     sha256 = "1abn4amsyys6vwn7csxsxny94n24ycca3xhqxqcmdc4j0dzn3kmb";
   };
 
-  buildInputs = [ pkgconfig glib gtk2 python27 pythonPackages.wrapPython pythonPackages.pygtk ];
-  pythonPath = with pythonPackages; [ pygtk pycairo ];
+  buildInputs = [ pkgconfig glib gtk2 python2Packages.python python2Packages.wrapPython python2Packages.pygtk ];
+  pythonPath = with python2Packages; [ pygtk pycairo ];
 
   installPhase = ''
-    make install DESTDIR=$out BINDIR=/bin PY_LIBDIR=/lib/python2.7
+    make install DESTDIR=$out BINDIR=/bin PY_LIBDIR=/lib/${python2Packages.python.libPrefix}
     wrapProgram $out/bin/pybootchartgui \
       --prefix PYTHONPATH : "$PYTHONPATH:$(toPythonPath $out)"
   '';