diff --git a/Nefarius.Peripherals.SerialPort/SerialPort.cs b/Nefarius.Peripherals.SerialPort/SerialPort.cs
index 8c8d25d..9dbe232 100644
--- a/Nefarius.Peripherals.SerialPort/SerialPort.cs
+++ b/Nefarius.Peripherals.SerialPort/SerialPort.cs
@@ -190,7 +190,7 @@ public partial class SerialPort : IDisposable
 
     private void InternalClose()
     {
-        Win32Com.CancelIo(_hPort.DangerousGetHandle());
+        PInvoke.CancelIo(_hPort);
         if (_rxThread != null)
         {
             _rxThread.Abort();
@@ -542,7 +542,7 @@ public partial class SerialPort : IDisposable
                         {
                             if (Marshal.GetLastWin32Error() == (int)WIN32_ERROR.ERROR_IO_PENDING)
                             {
-                                Win32Com.CancelIo(_hPort.DangerousGetHandle());
+                                PInvoke.CancelIo(_hPort);
                                 gotBytes = 0;
                             }
                             else
diff --git a/Nefarius.Peripherals.SerialPort/Win32PInvoke/Win32Com.cs b/Nefarius.Peripherals.SerialPort/Win32PInvoke/Win32Com.cs
index a535791..9d34003 100644
--- a/Nefarius.Peripherals.SerialPort/Win32PInvoke/Win32Com.cs
+++ b/Nefarius.Peripherals.SerialPort/Win32PInvoke/Win32Com.cs
@@ -20,14 +20,7 @@ internal class Win32Com
 
     [DllImport("kernel32.dll")]
     internal static extern Boolean GetHandleInformation(IntPtr hObject, out UInt32 lpdwFlags);
-
-    [DllImport("kernel32.dll")]
-    internal static extern Boolean CancelIo(IntPtr hFile);
-
-    [DllImport("kernel32.dll", SetLastError = true)]
-    internal static extern Boolean ReadFile(IntPtr hFile, [Out] Byte[] lpBuffer, UInt32 nNumberOfBytesToRead,
-        out UInt32 nNumberOfBytesRead, IntPtr lpOverlapped);
-
+    
     [DllImport("kernel32.dll")]
     internal static extern Boolean TransmitCommChar(IntPtr hFile, Byte cChar);