diff --git a/pkgs/development/python-modules/sphinx-hoverxref/default.nix b/pkgs/development/python-modules/sphinx-hoverxref/default.nix
index f11db7fc973..d6237387bf8 100644
--- a/pkgs/development/python-modules/sphinx-hoverxref/default.nix
+++ b/pkgs/development/python-modules/sphinx-hoverxref/default.nix
@@ -21,7 +21,7 @@
 buildPythonPackage rec {
   pname = "sphinx-hoverxref";
   version = "1.3.0";
-  format = "flit";
+  format = "pyproject";
   outputs = [ "out" "doc" ];
 
   src = fetchFromGitHub {