[Vala] How to connect to signal if there's a property with the same name?

["marcin saepia net" <marcin saepia net>]

Hello,

I need to connect to "closed" signal of GDBusConnection, but because there
is a property with the same name, valac refuses to compile and throws the
following error

src/common/daemon/base.vala:63.11-63.35: error: The name `connect' does not
exist in the context of `bool'
          connection.closed.connect(on_dbus_connection_closed);
          ^^^^^^^^^^^^^^^^^^^^^^^^^

How can I overcome this?

Marcin