diff --git a/bridge/mattermost/handlers.go b/bridge/mattermost/handlers.go
index d75e8d40..cd625c55 100644
--- a/bridge/mattermost/handlers.go
+++ b/bridge/mattermost/handlers.go
@@ -104,6 +104,7 @@ func (b *Bmattermost) handleMatterClient(messages chan *config.Message) {
 			Channel:  message.Channel,
 			Text:     message.Text,
 			ID:       message.Post.Id,
+			ParentID: message.Post.ParentId,
 			Extra:    make(map[string][]interface{}),
 		}
 
@@ -163,7 +164,7 @@ func (b *Bmattermost) handleUploadFile(msg *config.Message) (string, error) {
 		if b.GetBool("PrefixMessagesWithNick") {
 			msg.Text = msg.Username + msg.Text
 		}
-		res, err = b.mc.PostMessageWithFiles(channelID, msg.Text, []string{id})
+		res, err = b.mc.PostMessageWithFiles(channelID, msg.Text, msg.ParentID, []string{id})
 	}
 	return res, err
 }
diff --git a/bridge/mattermost/mattermost.go b/bridge/mattermost/mattermost.go
index b0dca0ba..ce4f4c33 100644
--- a/bridge/mattermost/mattermost.go
+++ b/bridge/mattermost/mattermost.go
@@ -124,7 +124,7 @@ func (b *Bmattermost) Send(msg config.Message) (string, error) {
 	// Upload a file if it exists
 	if msg.Extra != nil {
 		for _, rmsg := range helper.HandleExtra(&msg, b.General) {
-			if _, err := b.mc.PostMessage(b.mc.GetChannelId(rmsg.Channel, b.TeamID), rmsg.Username+rmsg.Text); err != nil {
+			if _, err := b.mc.PostMessage(b.mc.GetChannelId(rmsg.Channel, b.TeamID), rmsg.Username+rmsg.Text, msg.ParentID); err != nil {
 				b.Log.Errorf("PostMessage failed: %s", err)
 			}
 		}
@@ -144,5 +144,5 @@ func (b *Bmattermost) Send(msg config.Message) (string, error) {
 	}
 
 	// Post normal message
-	return b.mc.PostMessage(b.mc.GetChannelId(msg.Channel, b.TeamID), msg.Text)
+	return b.mc.PostMessage(b.mc.GetChannelId(msg.Channel, b.TeamID), msg.Text, msg.ParentID)
 }
diff --git a/matterclient/messages.go b/matterclient/messages.go
index 985cfe04..c2325c09 100644
--- a/matterclient/messages.go
+++ b/matterclient/messages.go
@@ -146,8 +146,8 @@ func (m *MMClient) GetPublicLinks(filenames []string) []string {
 	return output
 }
 
-func (m *MMClient) PostMessage(channelId string, text string) (string, error) { //nolint:golint
-	post := &model.Post{ChannelId: channelId, Message: text}
+func (m *MMClient) PostMessage(channelId string, text string, rootId string) (string, error) { //nolint:golint
+	post := &model.Post{ChannelId: channelId, Message: text, RootId: rootId}
 	res, resp := m.Client.CreatePost(post)
 	if resp.Error != nil {
 		return "", resp.Error
@@ -155,8 +155,8 @@ func (m *MMClient) PostMessage(channelId string, text string) (string, error) {
 	return res.Id, nil
 }
 
-func (m *MMClient) PostMessageWithFiles(channelId string, text string, fileIds []string) (string, error) { //nolint:golint
-	post := &model.Post{ChannelId: channelId, Message: text, FileIds: fileIds}
+func (m *MMClient) PostMessageWithFiles(channelId string, text string, rootId string, fileIds []string) (string, error) { //nolint:golint
+	post := &model.Post{ChannelId: channelId, Message: text, RootId: rootId, FileIds: fileIds}
 	res, resp := m.Client.CreatePost(post)
 	if resp.Error != nil {
 		return "", resp.Error
@@ -173,11 +173,11 @@ func (m *MMClient) SearchPosts(query string) *model.PostList {
 }
 
 // SendDirectMessage sends a direct message to specified user
-func (m *MMClient) SendDirectMessage(toUserId string, msg string) { //nolint:golint
-	m.SendDirectMessageProps(toUserId, msg, nil)
+func (m *MMClient) SendDirectMessage(toUserId string, msg string, rootId string) { //nolint:golint
+	m.SendDirectMessageProps(toUserId, msg, rootId, nil)
 }
 
-func (m *MMClient) SendDirectMessageProps(toUserId string, msg string, props map[string]interface{}) { //nolint:golint
+func (m *MMClient) SendDirectMessageProps(toUserId string, msg string, rootId string, props map[string]interface{}) { //nolint:golint
 	m.log.Debugf("SendDirectMessage to %s, msg %s", toUserId, msg)
 	// create DM channel (only happens on first message)
 	_, resp := m.Client.CreateDirectChannel(m.User.Id, toUserId)
@@ -194,7 +194,7 @@ func (m *MMClient) SendDirectMessageProps(toUserId string, msg string, props map
 
 	// build & send the message
 	msg = strings.Replace(msg, "\r", "", -1)
-	post := &model.Post{ChannelId: m.GetChannelId(channelName, m.Team.Id), Message: msg, Props: props}
+	post := &model.Post{ChannelId: m.GetChannelId(channelName, m.Team.Id), Message: msg, RootId: rootId, Props: props}
 	m.Client.CreatePost(post)
 }