diff --git a/component/firefox/buildout.cfg b/component/firefox/buildout.cfg
index c81a035fd1570cdc761b0fb26ffbdf6ce87ea6e5..dcf1d7cc39814dbe96b9305ec791820ea446ce84 100644
--- a/component/firefox/buildout.cfg
+++ b/component/firefox/buildout.cfg
@@ -126,6 +126,7 @@ library =
   ${gdk-pixbuf:location}/lib
   ${gettext:location}/lib
   ${glib:location}/lib
+  ${gtk-2:location}/lib
   ${gtk-3:location}/lib
   ${harfbuzz:location}/lib
   ${libepoxy:location}/lib