diff --git a/internal/reader/scan_standalone_reader.go b/internal/reader/scan_standalone_reader.go
index 5db1ea2b..c7c5a453 100644
--- a/internal/reader/scan_standalone_reader.go
+++ b/internal/reader/scan_standalone_reader.go
@@ -195,6 +195,12 @@ func (r *scanStandaloneReader) scan() {
 func (r *scanStandaloneReader) dump() {
 	nowDbId := 0
 	r.dumpClient = client.NewRedisClient(r.ctx, r.opts.Address, r.opts.Username, r.opts.Password, r.opts.Tls)
+	// Support prefer_replica=true in both Cluster and Standalone mode
+	if r.opts.PreferReplica {
+		r.dumpClient.Do("READONLY")
+		log.Infof("running dump() in read-only mode")
+	}
+	
 	for item := range r.needDumpQueue.Ch {
 		r.stat.NeedUpdateCount = int64(r.needDumpQueue.Len())
 		dbId := item.(dbKey).db