diff --git a/explorer/scan.go b/explorer/scan.go
index b3a4147..f59b3e1 100644
--- a/explorer/scan.go
+++ b/explorer/scan.go
@@ -173,7 +173,7 @@ func (e *Explorer) updateBlockLatestNumberTiming() {
 
 func (e *Explorer) syncLatestBlockNumber() error {
 	// Add latency updating strategy for history data sync
-	if e.latestBlockNum.Load()-e.currentBlockNum.Load() > 100 {
+	if e.latestBlockNum.Load() > e.currentBlockNum.Load() && e.latestBlockNum.Load()-e.currentBlockNum.Load() > 100 {
 		return nil
 	}