diff --git a/ansible/roles/stack-monitor-stateful/templates/alertmanagerconfig.yml b/ansible/roles/stack-monitor-stateful/templates/alertmanagerconfig.yml
index 9bc70dde990b2d27e9f65539a7b43f23d115c241..baaa7138978b8935631dee5f25bf630a0a6e7fb9 100644
--- a/ansible/roles/stack-monitor-stateful/templates/alertmanagerconfig.yml
+++ b/ansible/roles/stack-monitor-stateful/templates/alertmanagerconfig.yml
@@ -45,5 +45,5 @@ receivers:
         to: '{{ item.alerts_mailing_list }}'
         html: '{% raw %}{{ template "email.default.html" . }}{% endraw %}'
         headers:
-          subject: '[{{ env }}-{{cluster_name}}] {{ .GroupLabels.alertname }}'
+          subject: '[{{ env }}-{{cluster_name}}] {% raw %}{{ .GroupLabels.alertname }}{% endraw %}'
   {% endfor %}