diff --git a/pkgs/development/python-modules/pygtk/default.nix b/pkgs/development/python-modules/pygtk/default.nix
index 7d0896c1fb8b..0940ef00ac98 100644
--- a/pkgs/development/python-modules/pygtk/default.nix
+++ b/pkgs/development/python-modules/pygtk/default.nix
@@ -3,7 +3,7 @@
 
 buildPythonPackage rec {
   name = "pygtk-2.24.0";
-  
+
   disabled = isPy3k;
 
   src = fetchurl {
@@ -20,6 +20,8 @@ buildPythonPackage rec {
 
   buildPhase = "buildPhase";
 
+  NIX_CFLAGS_COMPILE = stdenv.lib.optionalString stdenv.isDarwin "-ObjC";
+
   installPhase = "installPhase";
 
   checkPhase = stdenv.lib.optionalString (libglade == null)