diff --git a/core/invitation.go b/core/invitation.go
index b09af51..f6f1d8d 100644
--- a/core/invitation.go
+++ b/core/invitation.go
@@ -192,18 +192,12 @@ func (iv *invitation) AcceptInvitation(ctx wshandler.ApiCallContext) {
 
 func (iv *invitation) DenyInvitation(ctx wshandler.ApiCallContext) {
 	invId, _ := primitive.ObjectIDFromHex(ctx.Arguments[0].(string))
-	now := time.Now().UTC().Unix()
 
 	var ivdoc invitationDoc
-	if err := iv.mongoClient.FindOneAndUpdateAs(invitation_collection_name, bson.M{
+	if err := iv.mongoClient.FindOneAs(invitation_collection_name, bson.M{
 		"_id": invId,
 		"to":  bson.M{"$eq": ctx.CallBy.Accid},
-	}, bson.M{
-		"$set": bson.M{
-			"denied": true,
-			"ts":     now,
-		},
-	}, &ivdoc, options.FindOneAndUpdate().SetReturnDocument(options.After).SetUpsert(false)); err != nil {
+	}, &ivdoc); err != nil {
 		logger.Println("DenyInvitation failed. addFriend(f2) err :", err)
 		return
 	}
@@ -213,6 +207,7 @@ func (iv *invitation) DenyInvitation(ctx wshandler.ApiCallContext) {
 		return
 	}
 
+	iv.mongoClient.Delete(invitation_collection_name, bson.M{"_id": invId})
 	iv.wsh.SendUpstreamMessage(&wshandler.UpstreamMessage{
 		Target: ivdoc.From.Hex(),
 		Body:   []invitationDoc{ivdoc},