diff --git a/stable/prometheus-operator/Chart.yaml b/stable/prometheus-operator/Chart.yaml
index 62ca5d036d..7d03be0236 100644
--- a/stable/prometheus-operator/Chart.yaml
+++ b/stable/prometheus-operator/Chart.yaml
@@ -12,7 +12,7 @@ sources:
   - https://github.com/coreos/kube-prometheus
   - https://github.com/coreos/prometheus-operator
   - https://coreos.com/operators/prometheus
-version: 8.15.13
+version: 8.15.14
 appVersion: 0.38.1
 tillerVersion: ">=2.12.0"
 home: https://github.com/coreos/prometheus-operator
diff --git a/stable/prometheus-operator/templates/alertmanager/alertmanager.yaml b/stable/prometheus-operator/templates/alertmanager/alertmanager.yaml
index d82b297f68..23375f7b37 100644
--- a/stable/prometheus-operator/templates/alertmanager/alertmanager.yaml
+++ b/stable/prometheus-operator/templates/alertmanager/alertmanager.yaml
@@ -101,7 +101,8 @@ spec:
   priorityClassName: {{.Values.alertmanager.alertmanagerSpec.priorityClassName }}
 {{- end }}
 {{- if .Values.alertmanager.alertmanagerSpec.additionalPeers }}
-  additionalPeers: {{.Values.alertmanager.alertmanagerSpec.additionalPeers }}
+  additionalPeers:
+{{ toYaml .Values.alertmanager.alertmanagerSpec.additionalPeers | indent 4 }}
 {{- end }}
   portName: {{ .Values.alertmanager.alertmanagerSpec.portName }}
 {{- end }}