diff --git a/src/header/mod.rs b/src/header/mod.rs
index b7cee39735..b846a568d9 100644
--- a/src/header/mod.rs
+++ b/src/header/mod.rs
@@ -9,11 +9,10 @@ use std::borrow::Cow::{Borrowed, Owned};
 use std::fmt;
 use std::raw::TraitObject;
 use std::str::from_utf8;
-use std::string::CowString;
 use std::collections::HashMap;
 use std::collections::hash_map::{Iter, Entry};
 use std::iter::{FromIterator, IntoIterator};
-use std::borrow::IntoCow;
+use std::borrow::{Cow, IntoCow};
 use std::{mem, raw};
 
 use uany::{UnsafeAnyExt};
@@ -30,7 +29,7 @@ mod common;
 mod shared;
 pub mod parsing;
 
-type HeaderName = UniCase<CowString<'static>>;
+type HeaderName = UniCase<Cow<'static, str>>;
 
 /// A trait for any object that will represent a header field and value.
 ///
diff --git a/src/http.rs b/src/http.rs
index f191dd7dba..7affb8bd92 100644
--- a/src/http.rs
+++ b/src/http.rs
@@ -1,11 +1,10 @@
 //! Pieces pertaining to the HTTP message protocol.
-use std::borrow::Cow::{Borrowed, Owned};
+use std::borrow::Cow::{self, Borrowed, Owned};
 use std::borrow::IntoCow;
 use std::cmp::min;
 use std::old_io::{self, Reader, IoResult, BufWriter};
 use std::num::from_u16;
 use std::str;
-use std::string::CowString;
 
 use url::Url;
 use url::ParseError as UrlError;
@@ -587,7 +586,7 @@ pub type StatusLine = (HttpVersion, RawStatus);
 
 /// The raw status code and reason-phrase.
 #[derive(PartialEq, Debug)]
-pub struct RawStatus(pub u16, pub CowString<'static>);
+pub struct RawStatus(pub u16, pub Cow<'static, str>);
 
 impl Clone for RawStatus {
     fn clone(&self) -> RawStatus {