diff --git a/upstream.go b/upstream.go
index 25b0bf5..9d1252a 100644
--- a/upstream.go
+++ b/upstream.go
@@ -1343,7 +1343,7 @@ func (uc *upstreamConn) handleMessage(msg *irc.Message) error {
 		// Ignore
 	case irc.RPL_STATSVLINE, rpl_statsping, irc.RPL_STATSBLINE, irc.RPL_STATSDLINE:
 		// Ignore
-	case irc.ERR_PASSWDMISMATCH, irc.ERR_ERRONEUSNICKNAME, irc.ERR_NICKNAMEINUSE, irc.ERR_NICKCOLLISION, irc.ERR_UNAVAILRESOURCE:
+	case irc.ERR_PASSWDMISMATCH, irc.ERR_ERRONEUSNICKNAME, irc.ERR_NICKNAMEINUSE, irc.ERR_NICKCOLLISION, irc.ERR_UNAVAILRESOURCE, irc.ERR_NOPERMFORHOST, irc.ERR_YOUREBANNEDCREEP:
 		if !uc.registered {
 			return fmt.Errorf("registration failed: %v", msg.Params[len(msg.Params)-1])
 		}