diff --git a/pkg/txn/client/client.go b/pkg/txn/client/client.go
index 9e1368dbd5e4f6669bddf382cea5607613326127..c606946e48a1c02d1e14f8cb50fbe9f55cfe7f32 100644
--- a/pkg/txn/client/client.go
+++ b/pkg/txn/client/client.go
@@ -74,7 +74,7 @@ func (client *txnClient) adjust() {
 	if client.clock == nil {
 		client.clock = clock.NewHLCClock(func() int64 {
 			return time.Now().Unix()
-		}, 0)
+		}, time.Millisecond*500)
 	}
 }