diff --git a/pkgs/applications/networking/browsers/firefox/20.0.nix b/pkgs/applications/networking/browsers/firefox/20.0.nix
index 1480a300820..3b2f9962a32 100644
--- a/pkgs/applications/networking/browsers/firefox/20.0.nix
+++ b/pkgs/applications/networking/browsers/firefox/20.0.nix
@@ -35,7 +35,7 @@ rec {
       #"--enable-profiling"
       "--disable-debug"
       "--enable-strip"
-      # "--with-system-jpeg" # Too old in nixpkgs
+      "--with-system-jpeg" # now we use recent libjpeg-turbo
       "--with-system-zlib"
       "--with-system-bz2"
       "--with-system-nspr"