diff --git a/flake.nix b/flake.nix
index 32814cb..c235b69 100644
--- a/flake.nix
+++ b/flake.nix
@@ -91,7 +91,7 @@
             {
               buildInputs = [ pkgs.python3.pkgs.mkdocs-material ];
             } ''
-            cp -r ${pkgs.lib.cleanSource ./.}/* .
+            cd ${self}
             mkdocs build --strict --site-dir $out
           '';