diff --git a/charts/rqlite/templates/_service.tpl b/charts/rqlite/templates/_service.tpl
index 6343b97..39a48c2 100644
--- a/charts/rqlite/templates/_service.tpl
+++ b/charts/rqlite/templates/_service.tpl
@@ -52,7 +52,8 @@ spec:
       port: {{ $clientPort }}
       targetPort: http
       {{- if ne $serviceType "ClusterIP" }}
-      {{- with dig "service" "nodePort" $.Values.service.nodePort $values }}
+      {{- /* This is an exception to the "inherits from voter configuration" rule: node ports must be unique. */}}
+      {{- with dig "service" "nodePort" 0 $values }}
       nodePort: {{ . }}
       {{- end }}
       {{- end }}
diff --git a/charts/rqlite/values.yaml b/charts/rqlite/values.yaml
index 67b3e37..ecf666a 100644
--- a/charts/rqlite/values.yaml
+++ b/charts/rqlite/values.yaml
@@ -261,6 +261,10 @@ service:
   ipFamilies: []
   # Leave null to automatically generate a ClusterIP
   clusterIP: null
+  # If type is NodePort or LoadBalancer, this may be defined to set an explicit node port.
+  # Note that this particular field is not inherited by the read-pool (if enabled) because
+  # uniqueness is required.
+  nodePort: null
   # Service port defaults to port 80 when config.tls.http.enabled is false, or 443
   # otherwise. But you can override the default choice here.
   port: null