diff --git a/src/file.rs b/src/file.rs
index 4e2617d..b3d5995 100644
--- a/src/file.rs
+++ b/src/file.rs
@@ -4,7 +4,7 @@ use std::ascii::AsciiExt;
 use std::env::current_dir;
 use std::fs;
 use std::io;
-use std::os::unix;
+use std::os::unix::raw;
 use std::os::unix::fs::{MetadataExt, PermissionsExt};
 use std::path::{Component, Path, PathBuf};
 
@@ -15,6 +15,39 @@ use options::TimeType;
 
 use self::fields as f;
 
+// Constant table copied from https://doc.rust-lang.org/src/std/sys/unix/ext/fs.rs.html#11-259
+// which is currently unstable and lacks vision for stabilization,
+// see https://github.com/rust-lang/rust/issues/27712
+const USER_READ: raw::mode_t = 0o400;
+const USER_WRITE: raw::mode_t = 0o200;
+const USER_EXECUTE: raw::mode_t = 0o100;
+#[allow(dead_code)]
+const USER_RWX: raw::mode_t = 0o700;
+const GROUP_READ: raw::mode_t = 0o040;
+const GROUP_WRITE: raw::mode_t = 0o020;
+const GROUP_EXECUTE: raw::mode_t = 0o010;
+#[allow(dead_code)]
+const GROUP_RWX: raw::mode_t = 0o070;
+const OTHER_READ: raw::mode_t = 0o004;
+const OTHER_WRITE: raw::mode_t = 0o002;
+const OTHER_EXECUTE: raw::mode_t = 0o001;
+#[allow(dead_code)]
+const OTHER_RWX: raw::mode_t = 0o007;
+#[allow(dead_code)]
+const ALL_READ: raw::mode_t = 0o444;
+#[allow(dead_code)]
+const ALL_WRITE: raw::mode_t = 0o222;
+#[allow(dead_code)]
+const ALL_EXECUTE: raw::mode_t = 0o111;
+#[allow(dead_code)]
+const ALL_RWX: raw::mode_t = 0o777;
+#[allow(dead_code)]
+const SETUID: raw::mode_t = 0o4000;
+#[allow(dead_code)]
+const SETGID: raw::mode_t = 0o2000;
+#[allow(dead_code)]
+const STICKY_BIT: raw::mode_t = 0o1000;
+
 
 /// A **File** is a wrapper around one of Rust's Path objects, along with
 /// associated data about the file.
@@ -104,7 +137,7 @@ impl<'dir> File<'dir> {
     /// current user. Executable files have different semantics than
     /// executable directories, and so should be highlighted differently.
     pub fn is_executable_file(&self) -> bool {
-        let bit = unix::fs::USER_EXECUTE;
+        let bit = USER_EXECUTE;
         self.is_file() && (self.metadata.permissions().mode() & bit) == bit
     }
 
@@ -299,15 +332,15 @@ impl<'dir> File<'dir> {
 
         f::Permissions {
             file_type:      self.type_char(),
-            user_read:      has_bit(unix::fs::USER_READ),
-            user_write:     has_bit(unix::fs::USER_WRITE),
-            user_execute:   has_bit(unix::fs::USER_EXECUTE),
-            group_read:     has_bit(unix::fs::GROUP_READ),
-            group_write:    has_bit(unix::fs::GROUP_WRITE),
-            group_execute:  has_bit(unix::fs::GROUP_EXECUTE),
-            other_read:     has_bit(unix::fs::OTHER_READ),
-            other_write:    has_bit(unix::fs::OTHER_WRITE),
-            other_execute:  has_bit(unix::fs::OTHER_EXECUTE),
+            user_read:      has_bit(USER_READ),
+            user_write:     has_bit(USER_WRITE),
+            user_execute:   has_bit(USER_EXECUTE),
+            group_read:     has_bit(GROUP_READ),
+            group_write:    has_bit(GROUP_WRITE),
+            group_execute:  has_bit(GROUP_EXECUTE),
+            other_read:     has_bit(OTHER_READ),
+            other_write:    has_bit(OTHER_WRITE),
+            other_execute:  has_bit(OTHER_EXECUTE),
         }
     }
 
diff --git a/src/main.rs b/src/main.rs
index 618d8f4..56e8389 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,4 +1,4 @@
-#![feature(convert, fs_mode)]
+#![feature(convert)]
 
 #![warn(trivial_casts, trivial_numeric_casts)]
 #![warn(unused_extern_crates, unused_qualifications)]