diff --git a/Nefarius.Peripherals.SerialPort/NativeMethods.txt b/Nefarius.Peripherals.SerialPort/NativeMethods.txt
index 0794950..88e99b5 100644
--- a/Nefarius.Peripherals.SerialPort/NativeMethods.txt
+++ b/Nefarius.Peripherals.SerialPort/NativeMethods.txt
@@ -20,4 +20,10 @@ WriteFile
 CreateFile
 ESCAPE_COMM_FUNCTION
 EscapeCommFunction
-CLEAR_COMM_ERROR_FLAGS
\ No newline at end of file
+CLEAR_COMM_ERROR_FLAGS
+CE_TXFULL
+CE_PTO
+CE_IOE
+CE_DNS
+CE_OOP
+CE_MODE
\ No newline at end of file
diff --git a/Nefarius.Peripherals.SerialPort/SerialPort.cs b/Nefarius.Peripherals.SerialPort/SerialPort.cs
index d5bc17d..a98a6da 100644
--- a/Nefarius.Peripherals.SerialPort/SerialPort.cs
+++ b/Nefarius.Peripherals.SerialPort/SerialPort.cs
@@ -501,7 +501,7 @@ public partial class SerialPort : IDisposable
                             s = s.Append("Framing,");
                         }
 
-                        if (((uint)errs & Win32Com.CE_IOE) != 0)
+                        if (((uint)errs & PInvoke.CE_IOE) != 0)
                         {
                             s = s.Append("IO,");
                         }
@@ -521,7 +521,7 @@ public partial class SerialPort : IDisposable
                             s = s.Append("Parity,");
                         }
 
-                        if (((uint)errs & Win32Com.CE_TXFULL) != 0)
+                        if (((uint)errs & PInvoke.CE_TXFULL) != 0)
                         {
                             s = s.Append("Transmit Overflow,");
                         }
diff --git a/Nefarius.Peripherals.SerialPort/Win32PInvoke/Win32Com.cs b/Nefarius.Peripherals.SerialPort/Win32PInvoke/Win32Com.cs
index 2fae8d2..5603c89 100644
--- a/Nefarius.Peripherals.SerialPort/Win32PInvoke/Win32Com.cs
+++ b/Nefarius.Peripherals.SerialPort/Win32PInvoke/Win32Com.cs
@@ -3,16 +3,9 @@ using System.Runtime.InteropServices;
 
 namespace Nefarius.Peripherals.SerialPort.Win32PInvoke;
 
+[Obsolete("use CsWin32 instead.")]
 internal class Win32Com
 {
-    //Constants for lpErrors:
-    internal const UInt32 CE_TXFULL = 0x0100;
-    internal const UInt32 CE_PTO = 0x0200;
-    internal const UInt32 CE_IOE = 0x0400;
-    internal const UInt32 CE_DNS = 0x0800;
-    internal const UInt32 CE_OOP = 0x1000;
-    internal const UInt32 CE_MODE = 0x8000;
-
     [DllImport("kernel32.dll")]
     internal static extern Boolean GetHandleInformation(IntPtr hObject, out UInt32 lpdwFlags);