diff --git a/v2rayN/ServiceLib/Handler/CoreConfig/CoreConfigSingbox.cs b/v2rayN/ServiceLib/Handler/CoreConfig/CoreConfigSingbox.cs
index ba6fc69d00..f0b366d686 100644
--- a/v2rayN/ServiceLib/Handler/CoreConfig/CoreConfigSingbox.cs
+++ b/v2rayN/ServiceLib/Handler/CoreConfig/CoreConfigSingbox.cs
@@ -702,6 +702,7 @@ private int GenOutboundMux(ProfileItem node, Outbound4Sbox outbound)
                         enabled = true,
                         protocol = _config.mux4SboxItem.protocol,
                         max_connections = _config.mux4SboxItem.max_connections,
+                        padding = _config.mux4SboxItem.padding,
                     };
                     outbound.multiplex = mux;
                 }
diff --git a/v2rayN/ServiceLib/Models/ConfigItems.cs b/v2rayN/ServiceLib/Models/ConfigItems.cs
index ec7f746a09..1f816a51b2 100644
--- a/v2rayN/ServiceLib/Models/ConfigItems.cs
+++ b/v2rayN/ServiceLib/Models/ConfigItems.cs
@@ -202,6 +202,7 @@ public class Mux4SboxItem
     {
         public string protocol { get; set; }
         public int max_connections { get; set; }
+        public bool? padding { get; set; }
     }
 
     [Serializable]
diff --git a/v2rayN/ServiceLib/Models/SingboxConfig.cs b/v2rayN/ServiceLib/Models/SingboxConfig.cs
index 12689a1a5e..259bb39590 100644
--- a/v2rayN/ServiceLib/Models/SingboxConfig.cs
+++ b/v2rayN/ServiceLib/Models/SingboxConfig.cs
@@ -150,6 +150,7 @@ public class Multiplex4Sbox
         public bool enabled { get; set; }
         public string protocol { get; set; }
         public int max_connections { get; set; }
+        public bool? padding { get; set; }
     }
 
     public class Utls4Sbox