diff --git a/mailman3/templates/web.yaml b/mailman3/templates/web.yaml
index f1c4252..274e89f 100644
--- a/mailman3/templates/web.yaml
+++ b/mailman3/templates/web.yaml
@@ -76,7 +76,7 @@ spec:
             - name: SMTP_HOST_PASSWORD
               value: {{ .Values.smtp.host_password }}
             - name: SMTP_USE_TLS
-              value: {{ .Values.smtp.use_tls }}
+              value: "{{ .Values.smtp.use_tls }}"
             {{- else }}
             - name: SMTP_HOST
               value: {{ include "mailman3.fullname" . }}-core.{{ .Release.Namespace }}.svc.{{ $clusterDomain }}