diff --git a/deploy/charts/emqx/values.yaml b/deploy/charts/emqx/values.yaml
index c737c8808..1e580090d 100644
--- a/deploy/charts/emqx/values.yaml
+++ b/deploy/charts/emqx/values.yaml
@@ -211,7 +211,7 @@ ssl:
   enabled: false
   useExisting: false
   existingName: emqx-tls
-  dnsnames: {}
+  dnsnames: []
   issuer:
     name: letsencrypt-dns
     kind: ClusterIssuer