diff --git a/src/xmpp/stanza.go b/src/xmpp/stanza.go
index 237999b..93431b7 100644
--- a/src/xmpp/stanza.go
+++ b/src/xmpp/stanza.go
@@ -189,4 +189,5 @@ var (
 	ErrorNotAuthorized         = ErrorCondition{nsErrorStanzas, "not-authorized"}
 	ErrorConflict              = ErrorCondition{nsErrorStanzas, "conflict"}
 	ErrorNotAcceptable         = ErrorCondition{nsErrorStanzas, "not-acceptable"}
+	ErrorForbidden             = ErrorCondition{nsErrorStanzas, "forbidden"}
 )