diff --git a/pkgs/development/python-modules/sphinx-notfound-page/default.nix b/pkgs/development/python-modules/sphinx-notfound-page/default.nix
index c6255bbc538..edc8e2ce6b0 100644
--- a/pkgs/development/python-modules/sphinx-notfound-page/default.nix
+++ b/pkgs/development/python-modules/sphinx-notfound-page/default.nix
@@ -17,7 +17,7 @@
 buildPythonPackage rec {
   pname = "sphinx-notfound-page";
   version = "0.8.3";
-  format = "flit";
+  format = "pyproject";
   outputs = [ "out" "doc" ];
 
   src = fetchFromGitHub {