diff --git a/pkgs/applications/networking/mailreaders/thunderbird/5.x.nix b/pkgs/applications/networking/mailreaders/thunderbird/5.x.nix
index a8ee384d81d..a409cae0d28 100644
--- a/pkgs/applications/networking/mailreaders/thunderbird/5.x.nix
+++ b/pkgs/applications/networking/mailreaders/thunderbird/5.x.nix
@@ -79,5 +79,6 @@ stdenv.mkDerivation {
       # see http://www.mozilla.org/foundation/licensing.html
       if enableOfficialBranding then licenses.proprietary else licenses.mpl11;
     maintainers = with maintainers; [ pierron ];
+    platforms = with platforms; linux;
   };
 }