diff --git a/bridge/sender/sender_test.go b/bridge/sender/sender_test.go
index 2fad6ca3c..be20124a4 100644
--- a/bridge/sender/sender_test.go
+++ b/bridge/sender/sender_test.go
@@ -121,7 +121,7 @@ func testBatchSender(t *testing.T, batchSize int) {
 		eg.Go(func() error {
 			for i := 0; i < TXBatch; i++ {
 				toAddr := common.HexToAddress("0x4592d8f8d7b001e72cb26a73e4fa1806a51ac79d")
-				id := strconv.Itoa(i + (index+1)*1000)
+				id := strconv.Itoa(i + index*1000)
 				_, err := newSender.SendTransaction(id, &toAddr, big.NewInt(1), nil)
 				if errors.Is(err, sender.ErrNoAvailableAccount) {
 					<-time.After(time.Second)