diff --git a/default.nix b/default.nix
index b38a12aaa..69be71e21 100644
--- a/default.nix
+++ b/default.nix
@@ -26,7 +26,7 @@ let
     };
   };
 
-  readTree' = import ./read-tree.nix;
+  readTree' = import ./nix/readTree {};
 
   localPkgs = readTree: {
     fun           = readTree ./fun;
diff --git a/read-tree.nix b/nix/readTree/default.nix
similarity index 99%
rename from read-tree.nix
rename to nix/readTree/default.nix
index 052865914..c48928ee1 100644
--- a/read-tree.nix
+++ b/nix/readTree/default.nix
@@ -1,3 +1,5 @@
+{ ... }:
+
 args: initPath:
 
 let