diff --git a/README.md b/README.md
index 4961ff7e..3cb277cb 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,9 @@
-TUN interfaces [![Crates.io](https://img.shields.io/crates/v/tun.svg)](https://crates.io/crates/tun) ![tun](https://docs.rs/tun/badge.svg) ![WTFPL](http://img.shields.io/badge/license-WTFPL-blue.svg)
+TUN interfaces 
 ==============
+[![Crates.io](https://img.shields.io/crates/v/tun.svg)](https://crates.io/crates/tun)
+![tun](https://docs.rs/tun/badge.svg)
+![WTFPL](http://img.shields.io/badge/license-WTFPL-blue.svg)
+
 This crate allows the creation and usage of TUN interfaces, the aim is to make this cross-platform.
 
 Usage
@@ -8,7 +12,7 @@ First, add the following to your `Cargo.toml`:
 
 ```toml
 [dependencies]
-tun = "0.6.1"
+tun = "0.6"
 ```
 
 Next, add this to your crate root:
@@ -21,7 +25,7 @@ If you want to use the TUN interface with mio/tokio, you need to enable the `asy
 
 ```toml
 [dependencies]
-tun = { version = "0.6.1", features = ["async"] }
+tun = { version = "0.6", features = ["async"] }
 ```
 
 Example
diff --git a/src/async/codec.rs b/src/async/codec.rs
index 07b2b55a..f81dd088 100644
--- a/src/async/codec.rs
+++ b/src/async/codec.rs
@@ -14,7 +14,6 @@
 
 use std::io;
 
-use byteorder::{NativeEndian, NetworkEndian, WriteBytesExt};
 use bytes::{BufMut, Bytes, BytesMut};
 use tokio_util::codec::{Decoder, Encoder};
 
@@ -54,6 +53,7 @@ impl PacketProtocol {
     }
 
     #[cfg(target_os = "windows")]
+    #[allow(dead_code)]
     fn into_pi_field(self) -> Result<u16, io::Error> {
         unimplemented!()
     }
@@ -132,19 +132,24 @@ impl Encoder<TunPacket> for TunPacketCodec {
     type Error = io::Error;
 
     fn encode(&mut self, item: TunPacket, dst: &mut BytesMut) -> Result<(), Self::Error> {
-        dst.reserve(item.get_bytes().len() + 4);
+        dst.reserve(item.get_bytes().len() + if self.0 { 4 } else { 0 });
         match item {
-            TunPacket(proto, bytes) if self.0 => {
-                // build the packet information header comprising of 2 u16
-                // fields: flags and protocol.
-                let mut buf = Vec::<u8>::with_capacity(4);
-
-                // flags is always 0
-                buf.write_u16::<NativeEndian>(0)?;
-                // write the protocol as network byte order
-                buf.write_u16::<NetworkEndian>(proto.into_pi_field()?)?;
-
-                dst.put_slice(&buf);
+            TunPacket(_proto, bytes) if self.0 => {
+                #[cfg(unix)]
+                {
+                    use byteorder::{NativeEndian, NetworkEndian, WriteBytesExt};
+
+                    // build the packet information header comprising of 2 u16
+                    // fields: flags and protocol.
+                    let mut buf = Vec::<u8>::with_capacity(4);
+
+                    // flags is always 0
+                    buf.write_u16::<NativeEndian>(0)?;
+                    // write the protocol as network byte order
+                    buf.write_u16::<NetworkEndian>(_proto.into_pi_field()?)?;
+
+                    dst.put_slice(&buf);
+                }
                 dst.put(bytes);
             }
             TunPacket(_, bytes) => dst.put(bytes),
diff --git a/src/error.rs b/src/error.rs
index f71efefe..f6e9e53b 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -54,4 +54,13 @@ pub enum Error {
     WintunError(#[from] wintun::Error),
 }
 
+impl From<Error> for io::Error {
+    fn from(value: Error) -> Self {
+        match value {
+            Error::Io(err) => err,
+            _ => io::Error::new(io::ErrorKind::Other, value),
+        }
+    }
+}
+
 pub type Result<T, E = Error> = ::std::result::Result<T, E>;