diff --git a/zetaclient/zetacore_observer.go b/zetaclient/zetacore_observer.go
index 30871f9200..fb208dd98d 100644
--- a/zetaclient/zetacore_observer.go
+++ b/zetaclient/zetacore_observer.go
@@ -178,7 +178,8 @@ func (co *CoreObserver) startSendScheduler() {
 								co.logger.ZetaChainWatcher.Error().Msgf("mismatch chainid: want %d, got %d", c.ChainId, params.ReceiverChainId)
 								continue
 							}
-							if params.OutboundTxTssNonce > cctxList[0].GetCurrentOutTxParam().OutboundTxTssNonce+120 {
+							const MaxLookaheadNonce = 120
+							if params.OutboundTxTssNonce > cctxList[0].GetCurrentOutTxParam().OutboundTxTssNonce+MaxLookaheadNonce {
 								co.logger.ZetaChainWatcher.Error().Msgf("nonce too high: signing %d, earliest pending %d", params.OutboundTxTssNonce, cctxList[0].GetCurrentOutTxParam().OutboundTxTssNonce)
 								break
 							}