diff --git a/pkgs/development/python-modules/pip-tools/default.nix b/pkgs/development/python-modules/pip-tools/default.nix
index 48818a594059..406378adddd9 100644
--- a/pkgs/development/python-modules/pip-tools/default.nix
+++ b/pkgs/development/python-modules/pip-tools/default.nix
@@ -17,7 +17,7 @@
 buildPythonPackage rec {
   pname = "pip-tools";
   version = "6.12.1";
-  format = "setuptools";
+  format = "pyproject";
 
   disabled = pythonOlder "3.7";