diff --git a/pkgs/development/python-modules/shapely/1.8.nix b/pkgs/development/python-modules/shapely/1.8.nix
index e04100f4a390..0e1c3135ab99 100644
--- a/pkgs/development/python-modules/shapely/1.8.nix
+++ b/pkgs/development/python-modules/shapely/1.8.nix
@@ -17,7 +17,7 @@
 buildPythonPackage rec {
   pname = "shapely";
   version = "1.8.5";
-  format = "pyproject";
+  pyproject = true;
 
   disabled = pythonOlder "3.7";