1 files changed, 3 insertions, 2 deletions
diff --git a/src/doc/guide-unsafe.md b/src/doc/guide-unsafe.md
index 11bc0bc30f2..25ca07ad74f 100644
--- a/src/doc/guide-unsafe.md
+++ b/src/doc/guide-unsafe.md
@@ -197,6 +197,7 @@ extern crate libc;
 use libc::{c_void, size_t, malloc, free};
 use std::mem;
 use std::ptr;
+# use std::boxed::Box;
 
 // Define a wrapper around the handle returned by the foreign code.
 // Unique<T> has the same semantics as Box<T>
@@ -265,7 +266,7 @@ impl<T: Send> Drop for Unique<T> {
 // A comparison between the built-in `Box` and this reimplementation
 fn main() {
     {
-        let mut x = box 5i;
+        let mut x = Box::new(5i);
         *x = 10;
     } // `x` is freed here
 
@@ -653,7 +654,7 @@ sugar for dynamic allocations via `malloc` and `free`:
 
 ```
 #![no_std]
-#![feature(lang_items)]
+#![feature(lang_items, box_syntax)]
 
 extern crate libc;