diff --git a/src/xmpp/stanza.go b/src/xmpp/stanza.go
index a21b5d1..33c4b0c 100644
--- a/src/xmpp/stanza.go
+++ b/src/xmpp/stanza.go
@@ -172,4 +172,5 @@ var (
 	FeatureNotImplemented = ErrorCondition{nsErrorStanzas, "feature-not-implemented"}
 	RemoteServerNotFound  = ErrorCondition{nsErrorStanzas, "remote-server-not-found"}
 	ServiceUnavailable    = ErrorCondition{nsErrorStanzas, "service-unavailable"}
+	NotAuthorized         = ErrorCondition{nsErrorStanzas, "not-authorized"}
 )