diff --git a/xmpp/handlers.go b/xmpp/handlers.go
index 7ad4d95..3039ff6 100644
--- a/xmpp/handlers.go
+++ b/xmpp/handlers.go
@@ -2395,9 +2395,9 @@ func handleSetQueryMAM(s xmpp.Sender, iq *stanza.IQ, query extensions.MAMQuery)
 		messages = telegram.ChronologicallySortMessages(messages, reverse)
 		complete = true
 	} else if beforeId != 0 || afterId != 0 {
-		if (beforeId != 0 && afterId != 0) && beforeId > afterId {
+		if (beforeId != 0 && afterId != 0) && beforeId < afterId {
 			iqAnswerSetError(answer, 400)
-			log.Debugf("MAM: before > after")
+			log.Debugf("MAM: before < after")
 			return
 		}