diff --git a/src/arch.rs b/src/arch.rs
index 5734f7f..ff31178 100644
--- a/src/arch.rs
+++ b/src/arch.rs
@@ -90,13 +90,13 @@ pub unsafe fn set_sp_limit(limit: *const u8) {
 }
 
 #[inline]
-fn align_down_mut<T>(sp: *mut T, n: uint) -> *mut T {
-  let sp = (sp as uint) & !(n - 1);
+fn align_down_mut<T>(sp: *mut T, n: usize) -> *mut T {
+  let sp = (sp as usize) & !(n - 1);
   sp as *mut T
 }
 
 // ptr::offset_mut is positive ints only
 #[inline]
-pub fn offset_mut<T>(ptr: *mut T, count: int) -> *mut T {
-  (ptr as int + count * (size_of::<T>() as int)) as *mut T
+pub fn offset_mut<T>(ptr: *mut T, count: isize) -> *mut T {
+  (ptr as isize + count * (size_of::<T>() as isize)) as *mut T
 }
diff --git a/src/lib.rs b/src/lib.rs
index 2c0843a..8765a16 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,4 +1,4 @@
-#![feature(phase, asm)]
+#![feature(asm)]
 #![no_std]
 
 #[macro_use]
diff --git a/src/main.rs b/src/main.rs
index 20d0a9d..2ce02b7 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -7,9 +7,9 @@ use lwkt::Context;
 use fn_box::FnBox;
 
 fn main() {
-  let f = box move |:| {
+  let f = Box::new(move |:| {
     println!("Hello, world!")
-  };
+  });
 
   let mut native = unsafe { Context::native() };
 
@@ -24,7 +24,7 @@ fn main() {
     }
   }
 
-  let mut ctx = box { (&mut native as *mut Context, null_mut()) };
+  let mut ctx = Box::new((&mut native as *mut Context, null_mut()));
   let mut green = Context::new(init, &mut *ctx as *mut _, f);
   ctx.1 = &mut green as *mut Context;
 
diff --git a/src/platform.rs b/src/platform.rs
index 48525c1..de69ed0 100644
--- a/src/platform.rs
+++ b/src/platform.rs
@@ -22,20 +22,20 @@ const STACK_FLAGS: libc::c_int = libc::MAP_STACK
                                | libc::MAP_ANON;
 
 impl Stack {
-  pub fn new(size: uint) -> Stack {
+  pub fn new(size: usize) -> Stack {
     let buf = match MemoryMap::new(size, &[MapReadable, MapWritable,
                                    MapNonStandardFlags(STACK_FLAGS)]) {
       Ok(map) => map,
-      Err(e) => panic!("mmap for stack of size {} failed: {}", size, e)
+      Err(e) => panic!("mmap for stack of size {} failed: {:?}", size, e)
     };
 
     if !protect_last_page(&buf) {
-      panic!("Could not memory-protect guard page. stack={}, errno={}",
+      panic!("Could not memory-protect guard page. stack={:p}, errno={}",
              buf.data(), errno());
     }
 
     let valgrind_id = unsafe {
-      stack_register(buf.data().offset(buf.len() as int) as *const _,
+      stack_register(buf.data().offset(buf.len() as isize) as *const _,
                      buf.data() as *const _)
     };
 
@@ -65,13 +65,13 @@ impl Drop for Stack {
 impl Stack {
   pub fn top(&mut self) -> *mut u8 {
     unsafe {
-      self.buf.data().offset(self.buf.len() as int)
+      self.buf.data().offset(self.buf.len() as isize)
     }
   }
 
   pub fn limit(&self) -> *const u8 {
     unsafe {
-      self.buf.data().offset(page_size() as int) as *const _
+      self.buf.data().offset(page_size() as isize) as *const _
     }
   }
 }
diff --git a/src/stack.rs b/src/stack.rs
index a481ad5..0a9af93 100644
--- a/src/stack.rs
+++ b/src/stack.rs
@@ -9,7 +9,7 @@ pub enum Stack {
 }
 
 impl Stack {
-  pub fn new(size: uint) -> Stack {
+  pub fn new(size: usize) -> Stack {
     Stack::Managed(platform::Stack::new(size))
   }