diff --git a/benches/bench_log.rs b/benches/bench_log.rs
index be2b4a53..91a4a885 100755
--- a/benches/bench_log.rs
+++ b/benches/bench_log.rs
@@ -8,9 +8,9 @@ extern crate serde;
 extern crate "rustc-serialize" as rustc_serialize;
 extern crate test;
 
-use std::io::ByRefWriter;
-use std::io::extensions::Bytes;
-use std::io;
+use std::old_io::ByRefWriter;
+use std::old_io::extensions::Bytes;
+use std::old_io;
 use std::num::FromPrimitive;
 use test::Bencher;
 
@@ -620,7 +620,7 @@ impl MyMemWriter0 {
 
 impl Writer for MyMemWriter0 {
     #[inline]
-    fn write(&mut self, buf: &[u8]) -> io::IoResult<()> {
+    fn write_all(&mut self, buf: &[u8]) -> old_io::IoResult<()> {
         self.buf.push_all(buf);
         Ok(())
     }
@@ -660,7 +660,7 @@ fn push_all_bytes(dst: &mut Vec<u8>, src: &[u8]) {
 
 impl Writer for MyMemWriter1 {
     #[inline]
-    fn write(&mut self, buf: &[u8]) -> io::IoResult<()> {
+    fn write_all(&mut self, buf: &[u8]) -> old_io::IoResult<()> {
         push_all_bytes(&mut self.buf, buf);
         Ok(())
     }
@@ -761,7 +761,7 @@ fn bench_serializer_slice(b: &mut Bencher) {
 
     b.iter(|| {
         for item in buf.iter_mut(){ *item = 0; }
-        let mut wr = std::io::BufWriter::new(&mut buf);
+        let mut wr = std::old_io::BufWriter::new(&mut buf);
 
         let mut serializer = json::Serializer::new(wr.by_ref());
         log.serialize(&mut serializer).unwrap();
diff --git a/serde2/benches/bench_log.rs b/serde2/benches/bench_log.rs
index 4742a8fb..33b915f6 100644
--- a/serde2/benches/bench_log.rs
+++ b/serde2/benches/bench_log.rs
@@ -8,8 +8,8 @@ extern crate serde2;
 extern crate "rustc-serialize" as rustc_serialize;
 extern crate test;
 
-use std::io;
-use std::io::ByRefWriter;
+use std::old_io;
+use std::old_io::ByRefWriter;
 use std::num::FromPrimitive;
 use test::Bencher;
 
@@ -928,7 +928,7 @@ impl MyMemWriter0 {
 
 impl Writer for MyMemWriter0 {
     #[inline]
-    fn write(&mut self, buf: &[u8]) -> io::IoResult<()> {
+    fn write_all(&mut self, buf: &[u8]) -> old_io::IoResult<()> {
         self.buf.push_all(buf);
         Ok(())
     }
@@ -968,7 +968,7 @@ fn push_all_bytes(dst: &mut Vec<u8>, src: &[u8]) {
 
 impl Writer for MyMemWriter1 {
     #[inline]
-    fn write(&mut self, buf: &[u8]) -> io::IoResult<()> {
+    fn write_all(&mut self, buf: &[u8]) -> old_io::IoResult<()> {
         push_all_bytes(&mut self.buf, buf);
         Ok(())
     }
@@ -1069,7 +1069,7 @@ fn bench_serializer_slice(b: &mut Bencher) {
 
     b.iter(|| {
         for item in buf.iter_mut(){ *item = 0; }
-        let mut wr = std::io::BufWriter::new(&mut buf);
+        let mut wr = std::old_io::BufWriter::new(&mut buf);
 
         let mut serializer = json::Writer::new(wr.by_ref());
         serializer.visit(&log).unwrap();
diff --git a/serde2/src/json/error.rs b/serde2/src/json/error.rs
index ddee5556..3af53a3e 100644
--- a/serde2/src/json/error.rs
+++ b/serde2/src/json/error.rs
@@ -1,6 +1,6 @@
 use std::error;
 use std::fmt;
-use std::io;
+use std::old_io;
 
 use de;
 
@@ -79,7 +79,7 @@ impl fmt::Debug for ErrorCode {
 pub enum Error {
     /// msg, line, col
     SyntaxError(ErrorCode, usize, usize),
-    IoError(io::IoError),
+    IoError(old_io::IoError),
     /*
     ExpectedError(String, String),
     MissingFieldError(String),
@@ -121,8 +121,8 @@ impl error::Error for Error {
     }
 }
 
-impl error::FromError<io::IoError> for Error {
-    fn from_error(error: io::IoError) -> Error {
+impl error::FromError<old_io::IoError> for Error {
+    fn from_error(error: old_io::IoError) -> Error {
         Error::IoError(error)
     }
 }
diff --git a/serde2/src/json/ser.rs b/serde2/src/json/ser.rs
index 0749a42a..fe82204e 100644
--- a/serde2/src/json/ser.rs
+++ b/serde2/src/json/ser.rs
@@ -1,5 +1,5 @@
 use std::f64;
-use std::io::{self, ByRefWriter, IoError};
+use std::old_io::{self, ByRefWriter, IoError};
 use std::num::{Float, FpCategory};
 use std::string::FromUtf8Error;
 
@@ -11,7 +11,7 @@ pub struct Writer<W> {
     writer: W,
 }
 
-impl<W: io::Writer> Writer<W> {
+impl<W: old_io::Writer> Writer<W> {
     /// Creates a new JSON visitr whose output will be written to the writer
     /// specified.
     #[inline]
@@ -28,7 +28,7 @@ impl<W: io::Writer> Writer<W> {
     }
 }
 
-impl<W: io::Writer> ser::Serializer for Writer<W> {
+impl<W: old_io::Writer> ser::Serializer for Writer<W> {
     type Value = ();
     type Error = IoError;
 
@@ -44,7 +44,7 @@ struct Visitor<'a, W: 'a> {
     writer: &'a mut W,
 }
 
-impl<'a, W: io::Writer> ser::Visitor for Visitor<'a, W> {
+impl<'a, W: old_io::Writer> ser::Visitor for Visitor<'a, W> {
     type Value = ();
     type Error = IoError;
 
@@ -188,7 +188,7 @@ impl<'a, W: io::Writer> ser::Visitor for Visitor<'a, W> {
 }
 
 #[inline]
-pub fn escape_bytes<W: io::Writer>(wr: &mut W, bytes: &[u8]) -> Result<(), IoError> {
+pub fn escape_bytes<W: old_io::Writer>(wr: &mut W, bytes: &[u8]) -> Result<(), IoError> {
     try!(wr.write_str("\""));
 
     let mut start = 0;
@@ -206,7 +206,7 @@ pub fn escape_bytes<W: io::Writer>(wr: &mut W, bytes: &[u8]) -> Result<(), IoErr
         };
 
         if start < i {
-            try!(wr.write(&bytes[start..i]));
+            try!(wr.write_all(&bytes[start..i]));
         }
 
         try!(wr.write_str(escaped));
@@ -215,34 +215,34 @@ pub fn escape_bytes<W: io::Writer>(wr: &mut W, bytes: &[u8]) -> Result<(), IoErr
     }
 
     if start != bytes.len() {
-        try!(wr.write(&bytes[start..]));
+        try!(wr.write_all(&bytes[start..]));
     }
 
     wr.write_str("\"")
 }
 
 #[inline]
-pub fn escape_str<W: io::Writer>(wr: &mut W, value: &str) -> Result<(), IoError> {
+pub fn escape_str<W: old_io::Writer>(wr: &mut W, value: &str) -> Result<(), IoError> {
     escape_bytes(wr, value.as_bytes())
 }
 
 #[inline]
-pub fn escape_char<W: io::Writer>(wr: &mut W, value: char) -> Result<(), IoError> {
+pub fn escape_char<W: old_io::Writer>(wr: &mut W, value: char) -> Result<(), IoError> {
     let mut buf = &mut [0; 4];
     value.encode_utf8(buf);
     escape_bytes(wr, buf)
 }
 
-fn fmt_f64_or_null<W: io::Writer>(wr: &mut W, value: f64) -> Result<(), IoError> {
+fn fmt_f64_or_null<W: old_io::Writer>(wr: &mut W, value: f64) -> Result<(), IoError> {
     match value.classify() {
         FpCategory::Nan | FpCategory::Infinite => wr.write_str("null"),
-        _ => wr.write_str(f64::to_str_digits(value, 6).as_slice()),
+        _ => wr.write_str(&f64::to_str_digits(value, 6)),
     }
 }
 
 #[inline]
 pub fn to_writer<W, T>(wr: &mut W, value: &T) -> Result<(), IoError>
-    where W: io::Writer,
+    where W: old_io::Writer,
           T: ser::Serialize,
 {
     let mut wr = Writer::new(wr.by_ref());
diff --git a/serde2/src/json/value.rs b/serde2/src/json/value.rs
index 7a2d89af..c620c3b0 100644
--- a/serde2/src/json/value.rs
+++ b/serde2/src/json/value.rs
@@ -1,6 +1,6 @@
 use std::collections::BTreeMap;
 use std::fmt;
-use std::io;
+use std::old_io;
 use std::str;
 
 use ser::{self, Serializer};
@@ -51,9 +51,9 @@ struct WriterFormatter<'a, 'b: 'a> {
     inner: &'a mut fmt::Formatter<'b>,
 }
 
-impl<'a, 'b> io::Writer for WriterFormatter<'a, 'b> {
-    fn write(&mut self, buf: &[u8]) -> io::IoResult<()> {
-        self.inner.write_str(str::from_utf8(buf).unwrap()).map_err(|_| io::IoError::last_error())
+impl<'a, 'b> old_io::Writer for WriterFormatter<'a, 'b> {
+    fn write_all(&mut self, buf: &[u8]) -> old_io::IoResult<()> {
+        self.inner.write_str(str::from_utf8(buf).unwrap()).map_err(|_| old_io::IoError::last_error())
     }
 }
 
diff --git a/src/json/error.rs b/src/json/error.rs
index b464c769..91cf4c95 100644
--- a/src/json/error.rs
+++ b/src/json/error.rs
@@ -1,6 +1,6 @@
 use std::error;
 use std::fmt;
-use std::io;
+use std::old_io;
 
 use de::{Token, TokenKind};
 
@@ -82,7 +82,7 @@ impl fmt::Debug for ErrorCode {
 pub enum Error {
     /// msg, line, col
     SyntaxError(ErrorCode, usize, usize),
-    IoError(io::IoError),
+    IoError(old_io::IoError),
     ExpectedError(String, String),
     MissingFieldError(String),
     UnknownVariantError(String),
@@ -118,8 +118,8 @@ impl error::Error for Error {
     }
 }
 
-impl error::FromError<io::IoError> for Error {
-    fn from_error(error: io::IoError) -> Error {
+impl error::FromError<old_io::IoError> for Error {
+    fn from_error(error: old_io::IoError) -> Error {
         Error::IoError(error)
     }
 }
diff --git a/src/json/mod.rs b/src/json/mod.rs
index ad5fa3e1..629dcff5 100644
--- a/src/json/mod.rs
+++ b/src/json/mod.rs
@@ -65,7 +65,7 @@ To serialize using `Serialize`:
 extern crate serde_macros;
 extern crate serde;
 
-use std::io::ByRefWriter;
+use std::old_io::ByRefWriter;
 use serde::json;
 use serde::Serialize;
 
@@ -319,7 +319,7 @@ pub mod error;
 #[cfg(test)]
 mod tests {
     use std::fmt::Debug;
-    use std::io;
+    use std::old_io;
     use std::str;
     use std::string;
     use std::collections::BTreeMap;
@@ -425,7 +425,7 @@ mod tests {
     }
 
     fn test_encode_ok<
-        T: PartialEq + Debug + ToJson + ser::Serialize<super::Serializer<Vec<u8>>, io::IoError>
+        T: PartialEq + Debug + ToJson + ser::Serialize<super::Serializer<Vec<u8>>, old_io::IoError>
     >(errors: &[(T, &str)]) {
         for &(ref value, out) in errors.iter() {
             let out = out.to_string();
diff --git a/src/json/ser.rs b/src/json/ser.rs
index 7d7b0f5a..3cd9192f 100644
--- a/src/json/ser.rs
+++ b/src/json/ser.rs
@@ -1,7 +1,7 @@
 use std::f32;
 use std::f64;
 use std::num::{Float, FpCategory};
-use std::io::{IoError, IoResult};
+use std::old_io::{IoError, IoResult};
 use std::string::FromUtf8Error;
 
 use ser::Serialize;
@@ -25,7 +25,7 @@ fn escape_bytes<W: Writer>(wr: &mut W, bytes: &[u8]) -> IoResult<()> {
         };
 
         if start < i {
-            try!(wr.write(&bytes[start..i]));
+            try!(wr.write_all(&bytes[start..i]));
         }
 
         try!(wr.write_str(escaped));
@@ -34,7 +34,7 @@ fn escape_bytes<W: Writer>(wr: &mut W, bytes: &[u8]) -> IoResult<()> {
     }
 
     if start != bytes.len() {
-        try!(wr.write(&bytes[start..]));
+        try!(wr.write_all(&bytes[start..]));
     }
 
     wr.write_str("\"")
@@ -69,12 +69,12 @@ fn spaces<W: Writer>(wr: &mut W, mut n: usize) -> IoResult<()> {
     const BUF: &'static [u8; LEN] = &[b' '; LEN];
 
     while n >= LEN {
-        try!(wr.write(BUF));
+        try!(wr.write_all(BUF));
         n -= LEN;
     }
 
     if n > 0 {
-        wr.write(&BUF[..n])
+        wr.write_all(&BUF[..n])
     } else {
         Ok(())
     }
diff --git a/src/json/value.rs b/src/json/value.rs
index 41221daa..01052a39 100644
--- a/src/json/value.rs
+++ b/src/json/value.rs
@@ -1,7 +1,7 @@
 use std::collections::{HashMap, BTreeMap, btree_map};
 use std::fmt;
-use std::io::{ByRefWriter, IoResult};
-use std::io;
+use std::old_io::{ByRefWriter, IoResult};
+use std::old_io;
 use std::str;
 use std::string::ToString;
 use std::vec;
@@ -221,8 +221,8 @@ struct WriterFormatter<'a, 'b: 'a> {
 }
 
 impl<'a, 'b> Writer for WriterFormatter<'a, 'b> {
-    fn write(&mut self, buf: &[u8]) -> IoResult<()> {
-        self.inner.write_str(str::from_utf8(buf).unwrap()).map_err(|_| io::IoError::last_error())
+    fn write_all(&mut self, buf: &[u8]) -> IoResult<()> {
+        self.inner.write_str(str::from_utf8(buf).unwrap()).map_err(|_| old_io::IoError::last_error())
     }
 }