diff --git a/mkdir/mkdir.rs b/mkdir/mkdir.rs
index 4ae6b79c0..264a64ccb 100644
--- a/mkdir/mkdir.rs
+++ b/mkdir/mkdir.rs
@@ -70,12 +70,12 @@ fn main() {
                                                         strconv::ExpNone,
                                                         false, false);
         if res.is_some() {
-            unsafe { std::cast::transmute(res.unwrap()) }
+            unsafe { std::mem::transmute(res.unwrap()) }
         } else {
             crash!(1, "no mode given");
         }
     } else {
-        unsafe { std::cast::transmute(0o755 as u32) }
+        unsafe { std::mem::transmute(0o755 as u32) }
     };
 
     let dirs = matches.free;
diff --git a/uptime/uptime.rs b/uptime/uptime.rs
index bc8173ab0..89ff30857 100644
--- a/uptime/uptime.rs
+++ b/uptime/uptime.rs
@@ -18,7 +18,7 @@ extern crate getopts;
 extern crate libc;
 
 use std::os;
-use std::cast::transmute;
+use std::mem::transmute;
 use std::io::{print, File};
 use std::ptr::null;
 use std::from_str::from_str;
diff --git a/users/users.rs b/users/users.rs
index 77f3da0a6..8494b244a 100644
--- a/users/users.rs
+++ b/users/users.rs
@@ -20,7 +20,7 @@ extern crate getopts;
 extern crate libc;
 
 use std::io::print;
-use std::cast;
+use std::mem;
 use std::os;
 use std::ptr;
 use std::str;
@@ -103,7 +103,7 @@ fn exec(filename: &str) {
             }
 
             if (*line).ut_type == USER_PROCESS {
-                let user = str::raw::from_c_str(cast::transmute(&(*line).ut_user));
+                let user = str::raw::from_c_str(mem::transmute(&(*line).ut_user));
                 users.push(user);
             }
         }