diff --git a/default.nix b/default.nix
index 866d3f3..a2639d5 100644
--- a/default.nix
+++ b/default.nix
@@ -124,7 +124,7 @@ let
             (    builtins.pathExists (path + /.version)
               && (    builtins.readFile (path + /.version) == version
                    || builtins.trace ''
-                        Skipping ${path} as not version ${version}.
+                        Skipping ${toString path} as not version ${version}.
                       '' false ) );
 
       # paths - Paths to search for nixpkgs.