diff --git a/internal/rootcoord/dml_channels.go b/internal/rootcoord/dml_channels.go
index fc848b15de7393fc24ea1ebfe24f72fcce8987bb..d7dd7bc6d5881867b9e180e2d8f0e97811881053 100644
--- a/internal/rootcoord/dml_channels.go
+++ b/internal/rootcoord/dml_channels.go
@@ -64,7 +64,7 @@ func (d *dmlChannels) GetDmlMsgStreamName() string {
 
 // ListChannels lists all dml channel names
 func (d *dmlChannels) ListChannels() []string {
-	chanNames := make([]string, 0)
+	var chanNames []string
 	d.refcnt.Range(
 		func(k, v interface{}) bool {
 			chanNames = append(chanNames, k.(string))