diff --git a/src/rustbook/build.rs b/src/rustbook/build.rs
index 12eb156873e8..f2ab68ddee0f 100644
--- a/src/rustbook/build.rs
+++ b/src/rustbook/build.rs
@@ -10,7 +10,6 @@
 
 //! Implementation of the `build` subcommand, used to compile a book.
 
-use std::os;
 use std::env;
 use std::old_io;
 use std::old_io::{fs, File, BufferedWriter, TempDir, IoResult};
diff --git a/src/rustbook/test.rs b/src/rustbook/test.rs
index 19c640ec7947..18a746f10aad 100644
--- a/src/rustbook/test.rs
+++ b/src/rustbook/test.rs
@@ -17,7 +17,6 @@ use error::Error;
 use term::Term;
 use book;
 use std::old_io::{Command, File};
-use std::os;
 use std::env;
 
 struct Test;