diff --git a/notifiers/mattermost.go b/notifiers/mattermost.go
index d7960168..5829cbe9 100644
--- a/notifiers/mattermost.go
+++ b/notifiers/mattermost.go
@@ -36,8 +36,8 @@ var mattermoster = &mattermost{&notifications.Notification{
 	AuthorUrl:   "https://github.com/adamboutcher",
 	Delay:       time.Duration(10 * time.Second),
 	Icon:        "far fa-comments",
-	SuccessData: null.NewNullString(`{"text": "The service {{.Service.Name}} is back online."}`),
-	FailureData: null.NewNullString(`{"text": "The service {{.Service.Name}} has gone offline."}`),
+	SuccessData: null.NewNullString(`{"icon_emoji":":white_check_mark:", "text": "The service {{.Service.Name}} is back online."}`),
+	FailureData: null.NewNullString(`{"icon_emoji":":x:", "text": "The service {{.Service.Name}} has gone offline."}`),
 	DataType:    "json",
 	RequestInfo: "Mattermost allows you to customize your own messages with many complex components.",
 	Limits:      60,