diff --git a/WindivertDotnet/TcpHeader.cs b/WindivertDotnet/TcpHeader.cs
index a7cb39b..f996ab7 100644
--- a/WindivertDotnet/TcpHeader.cs
+++ b/WindivertDotnet/TcpHeader.cs
@@ -1,6 +1,5 @@
 using System.Buffers.Binary;
 using System.Diagnostics;
-using System.Runtime.InteropServices;
 
 namespace WindivertDotnet
 {
@@ -11,7 +10,6 @@ namespace WindivertDotnet
     public struct TcpHeader
     {
         [DebuggerBrowsable(DebuggerBrowsableState.Never)]
-        [FieldOffset(0)]
         private ushort srcPort;
 
         /// <summary>
@@ -24,7 +22,6 @@ public ushort SrcPort
         }
 
         [DebuggerBrowsable(DebuggerBrowsableState.Never)]
-        [FieldOffset(2)]
         private ushort dstPort;
 
         /// <summary>
@@ -38,7 +35,6 @@ public ushort DstPort
 
 
         [DebuggerBrowsable(DebuggerBrowsableState.Never)]
-        [FieldOffset(4)]
         private uint seqNum;
 
         /// <summary>
@@ -52,7 +48,6 @@ public uint SeqNum
 
 
         [DebuggerBrowsable(DebuggerBrowsableState.Never)]
-        [FieldOffset(8)]
         private uint ackNum;
 
         /// <summary>
@@ -65,7 +60,6 @@ public uint AckNum
         }
 
         [DebuggerBrowsable(DebuggerBrowsableState.Never)]
-        [FieldOffset(12)]
         private byte bitfield;
 
 
@@ -91,7 +85,6 @@ public byte HdrLength
         /// <summary>
         /// 标记位
         /// </summary>
-        [FieldOffset(13)]
         public TcpFlag Flags;
 
 
@@ -150,7 +143,6 @@ public bool Urg
         }
 
         [DebuggerBrowsable(DebuggerBrowsableState.Never)]
-        [FieldOffset(14)]
         private ushort window;
 
         /// <summary>
@@ -163,7 +155,6 @@ public ushort Window
         }
 
         [DebuggerBrowsable(DebuggerBrowsableState.Never)]
-        [FieldOffset(16)]
         private ushort checksum;
 
         /// <summary>
@@ -176,7 +167,6 @@ public ushort Checksum
         }
 
         [DebuggerBrowsable(DebuggerBrowsableState.Never)]
-        [FieldOffset(18)]
         private ushort urgPtr;
 
         /// <summary>