diff --git a/pkgs/development/python-modules/shellingham/default.nix b/pkgs/development/python-modules/shellingham/default.nix
index c14c5ec4265..238d394ee11 100644
--- a/pkgs/development/python-modules/shellingham/default.nix
+++ b/pkgs/development/python-modules/shellingham/default.nix
@@ -4,6 +4,7 @@
 buildPythonPackage rec {
   pname = "shellingham";
   version = "1.3.2";
+  format = "pyproject";
 
   src = fetchPypi {
     inherit pname version;