diff --git a/src/libcore/cell.rs b/src/libcore/cell.rs
index cf293ded13f00..5d351adfca06b 100644
--- a/src/libcore/cell.rs
+++ b/src/libcore/cell.rs
@@ -78,12 +78,12 @@
 //! use std::cell::RefCell;
 //!
 //! struct Graph {
-//!     edges: Vec<(uint, uint)>,
-//!     span_tree_cache: RefCell<Option<Vec<(uint, uint)>>>
+//!     edges: Vec<(i32, i32)>,
+//!     span_tree_cache: RefCell<Option<Vec<(i32, i32)>>>
 //! }
 //!
 //! impl Graph {
-//!     fn minimum_spanning_tree(&self) -> Vec<(uint, uint)> {
+//!     fn minimum_spanning_tree(&self) -> Vec<(i32, i32)> {
 //!         // Create a new scope to contain the lifetime of the
 //!         // dynamic borrow
 //!         {
@@ -104,7 +104,7 @@
 //!         // This is the major hazard of using `RefCell`.
 //!         self.minimum_spanning_tree()
 //!     }
-//! #   fn calc_span_tree(&self) -> Vec<(uint, uint)> { vec![] }
+//! #   fn calc_span_tree(&self) -> Vec<(i32, i32)> { vec![] }
 //! }
 //! ```
 //!
@@ -125,7 +125,7 @@
 //!
 //! struct RcBox<T> {
 //!     value: T,
-//!     refcount: Cell<uint>
+//!     refcount: Cell<usize>
 //! }
 //!
 //! impl<T> Clone for Rc<T> {
@@ -279,8 +279,8 @@ pub enum BorrowState {
 }
 
 // Values [1, MAX-1] represent the number of `Ref` active
-// (will not outgrow its range since `uint` is the size of the address space)
-type BorrowFlag = uint;
+// (will not outgrow its range since `usize` is the size of the address space)
+type BorrowFlag = usize;
 const UNUSED: BorrowFlag = 0;
 const WRITING: BorrowFlag = -1;