diff --git a/model/profile.go b/model/profile.go
index cb8c048..d97911d 100644
--- a/model/profile.go
+++ b/model/profile.go
@@ -154,7 +154,7 @@ func (p *Profile) AddSentMessageToContactTimeline(onion string, messageTxt strin
 			contact.UnacknowledgedMessages = make(map[string]int)
 		}
 		contact.Timeline.Insert(message)
-		contact.UnacknowledgedMessages[eventID] = p.Timeline.Len() - 1
+		contact.UnacknowledgedMessages[eventID] = contact.Timeline.Len() - 1
 		return message
 	}
 	return nil
@@ -200,7 +200,7 @@ func (p *Profile) AckSentMessageToPeer(onion string, eventID string) {
 	if ok {
 		mIdx, ok := contact.UnacknowledgedMessages[eventID]
 		if ok {
-			p.Timeline.Messages[mIdx].Acknowledged = true
+			contact.Timeline.Messages[mIdx].Acknowledged = true
 			delete(contact.UnacknowledgedMessages, eventID)
 		}
 	}