diff --git a/pkg/services/alerting/notifiers/teams.go b/pkg/services/alerting/notifiers/teams.go
index 605b2742325..851e5a01c75 100644
--- a/pkg/services/alerting/notifiers/teams.go
+++ b/pkg/services/alerting/notifiers/teams.go
@@ -82,6 +82,8 @@ func (this *TeamsNotifier) Notify(evalContext *alerting.EvalContext) error {
 	message := this.Mention
 	if evalContext.Rule.State != m.AlertStateOK { //dont add message when going back to alert state ok.
 		message += " " + evalContext.Rule.Message
+	} else {
+		message += " " // summary must not be empty
 	}
 
 	body := map[string]interface{}{