diff --git a/client.go b/client.go
index 5c51ae63f..671bd2a76 100644
--- a/client.go
+++ b/client.go
@@ -72,11 +72,11 @@ var _ InternalQueryClient = NewNopInternalQueryClient()
 
 type NopInternalClient struct{}
 
-func NewNopInternalClient() NopInternalClient {
+func newNopInternalClient() NopInternalClient {
 	return NopInternalClient{}
 }
 
-var _ InternalClient = NewNopInternalClient()
+var _ InternalClient = newNopInternalClient()
 
 func (n NopInternalClient) MaxShardByIndex(context.Context) (map[string]uint64, error) {
 	return nil, nil
diff --git a/cluster.go b/cluster.go
index 45bbb835d..226221b99 100644
--- a/cluster.go
+++ b/cluster.go
@@ -227,7 +227,7 @@ func newCluster() *cluster {
 		closing:             make(chan struct{}),
 		joining:             make(chan struct{}),
 
-		InternalClient: NewNopInternalClient(),
+		InternalClient: newNopInternalClient(),
 
 		logger: NopLogger,
 	}