diff --git a/pkgs/development/python-modules/pytest-param-files/default.nix b/pkgs/development/python-modules/pytest-param-files/default.nix
index bf629cc356a..80dea1dbeaa 100644
--- a/pkgs/development/python-modules/pytest-param-files/default.nix
+++ b/pkgs/development/python-modules/pytest-param-files/default.nix
@@ -17,7 +17,7 @@ buildPythonPackage rec {
     hash = "sha256-Q7wWoggJN2w2a2umQHx5TsVcugqpovBEtOKruNMZQ8A=";
   };
 
-  format = "flit";
+  format = "pyproject";
 
   nativeBuildInputs = [ flit-core ];