diff --git a/charts/maas/templates/job-import.yaml b/charts/maas/templates/job-import.yaml
index 8077338..4b04548 100644
--- a/charts/maas/templates/job-import.yaml
+++ b/charts/maas/templates/job-import.yaml
@@ -68,13 +68,13 @@ spec:
             - name: MAAS_HTTP_BOOT
               value: {{ .Values.conf.maas.http_boot | quote }}
             - name: MAAS_NTP_SERVERS
-              value: {{ .Values.conf.maas.ntp.ntp_servers }}
+              value: {{ .Values.conf.maas.ntp.ntp_servers | join "," | quote }}
             - name: MAAS_NTP_EXTERNAL_ONLY
               value: {{ .Values.conf.maas.ntp.use_external_only | quote }}
             - name: MAAS_DNS_DNSSEC_REQUIRED
               value: {{ .Values.conf.maas.dns.require_dnssec | quote }}
             - name: MAAS_DNS_SERVERS
-              value: {{ .Values.conf.maas.dns.dns_servers }}
+              value: {{ .Values.conf.maas.dns.dns_servers | join "," | quote }}
             - name: MAAS_DEFAULT_OS
               value: {{ .Values.conf.maas.images.default_os | quote }}
             - name: MAAS_DEFAULT_DISTRO
diff --git a/charts/maas/values.yaml b/charts/maas/values.yaml
index bfcaf2c..f9a2c01 100644
--- a/charts/maas/values.yaml
+++ b/charts/maas/values.yaml
@@ -163,11 +163,11 @@ conf:
       # Use external only points region and rack serves and deployed nodes directly
       # at external NTP servers. Otherwise we have nodes -> rack -> region -> external
       use_external_only: false
-      ntp_servers: null
+      ntp_servers: []
     dns:
       require_dnssec: no
       # These are upstream servers
-      dns_servers: null
+      dns_servers: []
     proxy:
       # Whether deploying nodes should use MaaS region as an APT proxy
       proxy_enabled: false