diff --git a/src/rustbook/build.rs b/src/rustbook/build.rs
index 6f5fc5c1969f0..f2ab68ddee0f0 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};
@@ -82,7 +81,7 @@ fn render(book: &Book, tgt: &Path) -> CliResult<()> {
 
         let src;
         if env::args().len() < 3 {
-            src = os::getcwd().unwrap().clone();
+            src = env::current_dir().unwrap().clone();
         } else {
             src = Path::new(env::args().nth(2).unwrap().clone());
         }
@@ -150,7 +149,7 @@ impl Subcommand for Build {
     }
     fn usage(&self) {}
     fn execute(&mut self, term: &mut Term) -> CommandResult<()> {
-        let cwd = os::getcwd().unwrap();
+        let cwd = env::current_dir().unwrap();
         let src;
         let tgt;
 
diff --git a/src/rustbook/main.rs b/src/rustbook/main.rs
index ace57f0ac2c0b..9bcfc7f45d341 100644
--- a/src/rustbook/main.rs
+++ b/src/rustbook/main.rs
@@ -12,7 +12,6 @@
 #![feature(collections)]
 #![feature(core)]
 #![feature(old_io)]
-#![feature(os)]
 #![feature(env)]
 #![feature(old_path)]
 #![feature(rustdoc)]
diff --git a/src/rustbook/test.rs b/src/rustbook/test.rs
index d3cb8a7316e86..18a746f10aad7 100644
--- a/src/rustbook/test.rs
+++ b/src/rustbook/test.rs
@@ -17,7 +17,7 @@ use error::Error;
 use term::Term;
 use book;
 use std::old_io::{Command, File};
-use std::os;
+use std::env;
 
 struct Test;
 
@@ -35,7 +35,7 @@ impl Subcommand for Test {
     }
     fn usage(&self) {}
     fn execute(&mut self, term: &mut Term) -> CommandResult<()> {
-        let cwd = os::getcwd().unwrap();
+        let cwd = env::current_dir().unwrap();
         let src = cwd.clone();
 
         let summary = File::open(&src.join("SUMMARY.md"));