diff --git a/v4/export/dump.go b/v4/export/dump.go
index f953ad96..c746ea9b 100755
--- a/v4/export/dump.go
+++ b/v4/export/dump.go
@@ -116,6 +116,7 @@ func (d *Dumper) Dump() (dumpErr error) {
 	if err != nil {
 		return err
 	}
+	defer metaConn.Close()
 	m.recordStartTime(time.Now())
 	// for consistency lock, we can write snapshot info after all tables are locked.
 	// the binlog pos may changed because there is still possible write between we lock tables and write master status.