diff --git a/pkgs/development/python2-modules/pygtk/default.nix b/pkgs/development/python2-modules/pygtk/default.nix
index 08e1520c4c85..20e9498ea30e 100644
--- a/pkgs/development/python2-modules/pygtk/default.nix
+++ b/pkgs/development/python2-modules/pygtk/default.nix
@@ -5,6 +5,7 @@ buildPythonPackage rec {
   pname = "pygtk";
   outputs = [ "out" "dev" ];
   version = "2.24.0";
+  format = "other";
 
   disabled = isPy3k;