diff --git a/pkgs/applications/video/gnash/default.nix b/pkgs/applications/video/gnash/default.nix
index c3a4944ec63..3e358c48687 100644
--- a/pkgs/applications/video/gnash/default.nix
+++ b/pkgs/applications/video/gnash/default.nix
@@ -5,7 +5,10 @@
 , glib, gtk, x11, ming, dejagnu, python
 , lib, makeWrapper }:
 
+assert stdenv ? glibc;
+
 let version = "0.8.5"; in
+
 stdenv.mkDerivation rec {
   name = "gnash-${version}";