diff --git a/artiq/runtime.rs/libstd_artiq/io/buffered.rs b/artiq/runtime.rs/libstd_artiq/io/buffered.rs
index e23b74ff1..3088e4e63 100644
--- a/artiq/runtime.rs/libstd_artiq/io/buffered.rs
+++ b/artiq/runtime.rs/libstd_artiq/io/buffered.rs
@@ -17,6 +17,8 @@ use core::cmp;
 use core::fmt;
 use io::{self, DEFAULT_BUF_SIZE, Error, ErrorKind, SeekFrom};
 use io::memchr;
+use alloc::boxed::Box;
+use collections::vec::Vec;
 
 /// The `BufReader` struct adds buffering to any reader.
 ///
diff --git a/artiq/runtime.rs/libstd_artiq/io/cursor.rs b/artiq/runtime.rs/libstd_artiq/io/cursor.rs
index 1db50ee5b..88e7646d5 100644
--- a/artiq/runtime.rs/libstd_artiq/io/cursor.rs
+++ b/artiq/runtime.rs/libstd_artiq/io/cursor.rs
@@ -13,6 +13,8 @@ use io::prelude::*;
 
 use core::cmp;
 use io::{self, SeekFrom, Error, ErrorKind};
+use alloc::boxed::Box;
+use collections::vec::Vec;
 
 /// A `Cursor` wraps another type and provides it with a
 /// [`Seek`](trait.Seek.html) implementation.
diff --git a/artiq/runtime.rs/libstd_artiq/io/prelude.rs b/artiq/runtime.rs/libstd_artiq/io/prelude.rs
index eae5acf07..58df71e69 100644
--- a/artiq/runtime.rs/libstd_artiq/io/prelude.rs
+++ b/artiq/runtime.rs/libstd_artiq/io/prelude.rs
@@ -20,6 +20,3 @@
 
 pub use super::{Read, Write, Seek};
  pub use super::BufRead;
-
- pub use alloc::boxed::Box;
- pub use collections::vec::Vec;
diff --git a/artiq/runtime.rs/libstd_artiq/lib.rs b/artiq/runtime.rs/libstd_artiq/lib.rs
index 1ec357302..83c4fd83d 100644
--- a/artiq/runtime.rs/libstd_artiq/lib.rs
+++ b/artiq/runtime.rs/libstd_artiq/lib.rs
@@ -21,9 +21,10 @@ pub use collections::{binary_heap, borrow, boxed, btree_map, btree_set, fmt, lin
 pub mod prelude {
     pub mod v1 {
         pub use core::prelude::v1::*;
-        pub use collections::*;
-        pub use io::{Read, Write, Seek};
-        pub use io::BufRead;
+        pub use collections::boxed::Box;
+        pub use collections::borrow::ToOwned;
+        pub use collections::string::{String, ToString};
+        pub use collections::vec::Vec;
     }
 }