diff --git a/makefu/source.nix b/makefu/source.nix
index fde1d9680..ccdc7b9f0 100644
--- a/makefu/source.nix
+++ b/makefu/source.nix
@@ -13,7 +13,7 @@ let
               then "buildbot"
               else "makefu";
   _file = <stockholm> + "/makefu/1systems/${name}/source.nix";
-  ref = "3874de4"; # unstable @ 2017-12-08
+  ref = "475bec2"; # unstable @ 2017-08-04
                    # + do_sqlite3 ruby: 55a952be5b5
 
 in