diff --git a/pkgs/development/python-modules/goocalendar/default.nix b/pkgs/development/python-modules/goocalendar/default.nix
index bd26568b7047..9e1be50b436b 100644
--- a/pkgs/development/python-modules/goocalendar/default.nix
+++ b/pkgs/development/python-modules/goocalendar/default.nix
@@ -41,7 +41,7 @@ buildPythonPackage rec {
     description = "A calendar widget for GTK using PyGoocanvas.";
     homepage = "https://goocalendar.tryton.org/";
     changelog = "https://foss.heptapod.net/tryton/goocalendar/-/blob/${version}/CHANGELOG";
-    license = licenses.gpl2;
-    maintainers = [ maintainers.udono ];
+    license = licenses.gpl2Only;
+    maintainers = with maintainers; [ udono ];
   };
 }