--- a/libpurple/protocols/jabber/xmpp.c	Tue Jan 23 00:02:11 2024 -0600
+++ b/libpurple/protocols/jabber/xmpp.c	Tue Jan 23 00:03:38 2024 -0600
@@ -114,7 +114,8 @@
 {
 }
 
-G_DEFINE_DYNAMIC_TYPE(XMPPProtocol, xmpp_protocol, JABBER_TYPE_PROTOCOL);
+G_DEFINE_DYNAMIC_TYPE_EXTENDED(XMPPProtocol, xmpp_protocol,
+                               JABBER_TYPE_PROTOCOL, G_TYPE_FLAG_FINAL, {})
 
 /* This exists solely because the above macro makes xmpp_protocol_register_type
  * static. */