diff --git a/mkmain.rs b/mkmain.rs
index ebb71d26a..7dd36fc0b 100644
--- a/mkmain.rs
+++ b/mkmain.rs
@@ -1,7 +1,6 @@
 #![feature(core, env, io, os, path)]
 use std::env;
 use std::old_io::{File, Truncate, ReadWrite};
-use std::os;
 use std::old_path::Path;
 
 static TEMPLATE: &'static str = "\
@@ -9,16 +8,19 @@ static TEMPLATE: &'static str = "\
 extern crate \"@UTIL_CRATE@\" as uu@UTIL_CRATE@;
 
 use std::env;
-use std::os;
 use uu@UTIL_CRATE@::uumain;
 
+fn args() -> Vec<String> {
+    env::args().map(|a| a.into_string().unwrap()).collect()
+}
+
 fn main() {
-    env::set_exit_status(uumain(os::args()));
+    env::set_exit_status(uumain(args()));
 }
 ";
 
 fn main() {
-    let args = os::args();
+    let args : Vec<String> = env::args().map(|a| a.into_string().unwrap()).collect();
     if args.len() != 3 {
         println!("usage: mkbuild <crate> <outfile>");
         env::set_exit_status(1);
diff --git a/mkuutils.rs b/mkuutils.rs
index e9a2c0984..d30d6bb21 100644
--- a/mkuutils.rs
+++ b/mkuutils.rs
@@ -6,7 +6,7 @@ use std::os;
 use std::old_path::Path;
 
 fn main() {
-    let args = os::args();
+    let args : Vec<String> = env::args().map(|a| a.into_string().unwrap()).collect();
     if args.len() < 3 {
         println!("usage: mkuutils <outfile> <crates>");
         env::set_exit_status(1);
diff --git a/src/tee/tee.rs b/src/tee/tee.rs
index 754857eb1..199105be6 100644
--- a/src/tee/tee.rs
+++ b/src/tee/tee.rs
@@ -150,5 +150,5 @@ fn with_path<F, T>(path: &Path, mut cb: F) -> IoResult<T> where F: FnMut() -> Io
 }
 
 fn warn(message: &str) {
-    error!("{}: {}", os::args()[0], message);
+    error!("tee: {}", message);
 }
diff --git a/src/uutils/uutils.rs b/src/uutils/uutils.rs
index b839c8a3f..aaf92bc74 100644
--- a/src/uutils/uutils.rs
+++ b/src/uutils/uutils.rs
@@ -42,7 +42,7 @@ fn usage(cmap: &HashMap<&'static str, fn(Vec<String>) -> i32>) {
 
 fn main() {
     let umap = util_map();
-    let mut args = os::args();
+    let mut args : Vec<String> = env::args().map(|a| a.into_string().unwrap()).collect();
 
     // try binary name as util name.
     let binary = Path::new(args[0].as_slice());