diff --git a/pkgs/development/python-modules/pygmt/default.nix b/pkgs/development/python-modules/pygmt/default.nix
index 90b00d9cd344..77d2669ee0ac 100644
--- a/pkgs/development/python-modules/pygmt/default.nix
+++ b/pkgs/development/python-modules/pygmt/default.nix
@@ -20,7 +20,7 @@
 buildPythonPackage rec {
   pname = "pygmt";
   version = "0.11.0";
-  format = "pyproject";
+  pyproject = true;
 
   disabled = pythonOlder "3.9";