diff --git a/pkgs/applications/networking/browsers/icecat-3/default.nix b/pkgs/applications/networking/browsers/icecat-3/default.nix
index e55cd71effb9..91a56a436ab8 100644
--- a/pkgs/applications/networking/browsers/icecat-3/default.nix
+++ b/pkgs/applications/networking/browsers/icecat-3/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, pkgconfig, gtk, pango, perl, python, zip, libIDL
+{ stdenv, fetchurl, pkgconfig, gtk, pango, perl, python, ply, zip, libIDL
 , libjpeg, libpng, zlib, cairo, dbus, dbus_glib, bzip2, xlibs, alsaLib
 , gnomevfs, libgnomeui
 , freetype, fontconfig
@@ -16,7 +16,7 @@ stdenv.mkDerivation {
   buildInputs = [
     libgnomeui gnomevfs alsaLib
     pkgconfig gtk perl zip libIDL libjpeg libpng zlib cairo bzip2
-    python dbus dbus_glib pango freetype fontconfig
+    python ply dbus dbus_glib pango freetype fontconfig
     xlibs.libXi xlibs.libX11 xlibs.libXrender xlibs.libXft xlibs.libXt
   ];
 
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index cfafffe7aba1..03b98ef5a53c 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -6451,6 +6451,7 @@ let
     inherit fetchurl stdenv pkgconfig perl zip libjpeg libpng zlib cairo
       python dbus dbus_glib freetype fontconfig bzip2 xlibs alsaLib;
     inherit (gnome) libIDL libgnomeui gnomevfs gtk pango;
+    inherit (pythonPackages) ply;
   });
 
   icecatXulrunner3 = lowPrio (import ../applications/networking/browsers/icecat-3 {