diff --git a/alerting/provider/mattermost/mattermost.go b/alerting/provider/mattermost/mattermost.go
index 99ef2375..a9e5e165 100644
--- a/alerting/provider/mattermost/mattermost.go
+++ b/alerting/provider/mattermost/mattermost.go
@@ -32,7 +32,7 @@ func (provider *AlertProvider) ToCustomAlertProvider(service *core.Service, aler
 	for _, conditionResult := range result.ConditionResults {
 		var prefix string
 		if conditionResult.Success {
-			prefix = ":white_check_mark: "
+			prefix = ":white_check_mark:"
 		} else {
 			prefix = ":x:"
 		}