diff --git a/src/io/mod.rs b/src/io/mod.rs
index 301cfa5..8dd1ad1 100644
--- a/src/io/mod.rs
+++ b/src/io/mod.rs
@@ -23,34 +23,35 @@
 #[doc(inline)]
 pub use std::io::{Error, ErrorKind, IoSlice, IoSliceMut, Result, SeekFrom};
 
-pub use buf_read::{BufRead, BufReadExt, Lines};
+pub use buf_read::{BufRead, Lines};
 pub use buf_reader::BufReader;
 pub use copy::copy;
 pub use cursor::Cursor;
 pub use empty::{empty, Empty};
-pub use read::{Read, ReadExt};
+pub use read::Read;
 pub use repeat::{repeat, Repeat};
-pub use seek::{Seek, SeekExt};
+pub use seek::Seek;
 pub use sink::{sink, Sink};
 pub use stderr::{stderr, Stderr};
 pub use stdin::{stdin, Stdin};
 pub use stdout::{stdout, Stdout};
 pub use timeout::timeout;
-pub use write::{Write, WriteExt};
+pub use write::Write;
 
 pub mod prelude;
 
-mod buf_read;
+pub(crate) mod buf_read;
+pub(crate) mod read;
+pub(crate) mod seek;
+pub(crate) mod write;
+
 mod buf_reader;
 mod copy;
 mod cursor;
 mod empty;
-mod read;
 mod repeat;
-mod seek;
 mod sink;
 mod stderr;
 mod stdin;
 mod stdout;
 mod timeout;
-mod write;
diff --git a/src/io/prelude.rs b/src/io/prelude.rs
index eeb0ced..fb1b945 100644
--- a/src/io/prelude.rs
+++ b/src/io/prelude.rs
@@ -18,10 +18,10 @@ pub use crate::io::Seek;
 pub use crate::io::Write;
 
 #[doc(hidden)]
-pub use crate::io::BufReadExt as _;
+pub use crate::io::buf_read::BufReadExt as _;
 #[doc(hidden)]
-pub use crate::io::ReadExt as _;
+pub use crate::io::read::ReadExt as _;
 #[doc(hidden)]
-pub use crate::io::SeekExt as _;
+pub use crate::io::seek::SeekExt as _;
 #[doc(hidden)]
-pub use crate::io::WriteExt as _;
+pub use crate::io::write::WriteExt as _;
diff --git a/src/prelude.rs b/src/prelude.rs
index d28ec64..6efd747 100644
--- a/src/prelude.rs
+++ b/src/prelude.rs
@@ -27,10 +27,10 @@ pub use crate::stream::Stream;
 pub use crate::task_local;
 
 #[doc(hidden)]
-pub use crate::io::BufReadExt as _;
+pub use crate::io::buf_read::BufReadExt as _;
 #[doc(hidden)]
-pub use crate::io::ReadExt as _;
+pub use crate::io::read::ReadExt as _;
 #[doc(hidden)]
-pub use crate::io::SeekExt as _;
+pub use crate::io::seek::SeekExt as _;
 #[doc(hidden)]
-pub use crate::io::WriteExt as _;
+pub use crate::io::write::WriteExt as _;