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-rw-r--r--bridge/slack/slack.go3
1 files changed, 2 insertions, 1 deletions
diff --git a/bridge/slack/slack.go b/bridge/slack/slack.go
index 23c856bd..89ff296c 100644
--- a/bridge/slack/slack.go
+++ b/bridge/slack/slack.go
@@ -498,7 +498,8 @@ func (b *Bslack) prepareMessageOptions(msg *config.Message) []slack.MsgOption {
var attachments []slack.Attachment
// add a callback ID so we can see we created it
- attachments = append(attachments, slack.Attachment{CallbackID: "matterbridge_" + b.uuid})
+ const zeroWidthSpace = "\u200b"
+ attachments = append(attachments, slack.Attachment{CallbackID: "matterbridge_" + b.uuid, Fallback: zeroWidthSpace})
// add file attachments
attachments = append(attachments, b.createAttach(msg.Extra)...)
// add slack attachments (from another slack bridge)