diff --git a/pkgs/tools/misc/rrdtool/default.nix b/pkgs/tools/misc/rrdtool/default.nix
index 11f9d32b1545..524e61dfaf37 100644
--- a/pkgs/tools/misc/rrdtool/default.nix
+++ b/pkgs/tools/misc/rrdtool/default.nix
@@ -9,8 +9,9 @@ stdenv.mkDerivation rec {
   buildInputs = [ gettext perl pkgconfig libxml2 pango cairo groff ];
   
   postInstall = ''
-    # for munin support
-    mv $out/lib/perl/5*/*/*.pm $out/lib/perl/5*/
+    # for munin and rrdtool support
+    mkdir -p $out/lib/perl5/site_perl/
+    mv $out/lib/perl/5* $out/lib/perl5/site_perl/
   '';
 
   meta = with stdenv.lib; {