diff --git a/pkgs/development/python-modules/sphinx-pytest/default.nix b/pkgs/development/python-modules/sphinx-pytest/default.nix
index 6d05a38d63a..ecb2cbf55e7 100644
--- a/pkgs/development/python-modules/sphinx-pytest/default.nix
+++ b/pkgs/development/python-modules/sphinx-pytest/default.nix
@@ -18,7 +18,7 @@ buildPythonPackage rec {
     hash = "sha256-vRHPq6BAuhn5QvHG2BGen9v6ezA3RgFVtustsNxU+n8=";
   };
 
-  format = "flit";
+  format = "pyproject";
 
   nativeBuildInputs = [ flit-core ];