diff --git a/web/assets/js/model/inbound.js b/web/assets/js/model/inbound.js
index e38160606..c653eb7ae 100644
--- a/web/assets/js/model/inbound.js
+++ b/web/assets/js/model/inbound.js
@@ -323,7 +323,7 @@ class KcpStreamSettings extends XrayCommonClass {
         uplinkCapacity = 5,
         downlinkCapacity = 20,
         cwndMultiplier = 1,
-        maxSendingWindow = 1350,
+        maxSendingWindow = 2097152,
     ) {
         super();
         this.mtu = mtu;