diff --git a/src/libcore/box.rs b/src/libcore/box.rs
index 114c495d64d..dc96aebcebc 100644
--- a/src/libcore/box.rs
+++ b/src/libcore/box.rs
@@ -3,13 +3,8 @@ export ptr_eq;
 #[doc(
   brief = "Determine if two shared boxes point to the same object"
 )]
-pure fn ptr_eq<T>(a: @T, b: @T) -> bool {
-    // FIXME: ptr::addr_of
-    unsafe {
-        let a_ptr: uint = unsafe::reinterpret_cast(a);
-        let b_ptr: uint = unsafe::reinterpret_cast(b);
-        ret a_ptr == b_ptr;
-    }
+pure fn ptr_eq<T>(a: @T, b: @T) -> bool unchecked {
+    ptr::addr_of(*a) == ptr::addr_of(*b)
 }
 
 #[test]