diff --git a/Cargo.lock b/Cargo.lock
index 123276b776e..47291420043 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -238,6 +238,17 @@ dependencies = [
  "quick-error 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "isatty"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.40 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.37 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "itertools"
 version = "0.7.8"
@@ -251,6 +262,15 @@ name = "itoa"
 version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "kernel32-sys"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "lazy_static"
 version = "0.2.11"
@@ -523,9 +543,9 @@ dependencies = [
  "env_logger 0.5.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "failure 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "getopts 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "isatty 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "itertools 0.7.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.40 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-ap-rustc_target 134.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -536,7 +556,6 @@ dependencies = [
  "term 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "toml 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-segmentation 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -722,6 +741,11 @@ name = "void"
 version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "winapi"
+version = "0.2.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "winapi"
 version = "0.3.4"
@@ -731,6 +755,11 @@ dependencies = [
  "winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "winapi-build"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "winapi-i686-pc-windows-gnu"
 version = "0.4.0"
@@ -780,8 +809,10 @@ dependencies = [
 "checksum fuchsia-zircon-sys 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "3dcaa9ae7725d12cdb85b3ad99a434db70b468c09ded17e012d86b5c1010f7a7"
 "checksum getopts 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)" = "b900c08c1939860ce8b54dc6a89e26e00c04c380fd0e09796799bd7f12861e05"
 "checksum humantime 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "0484fda3e7007f2a4a0d9c3a703ca38c71c54c55602ce4660c419fd32e188c9e"
+"checksum isatty 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)" = "a118a53ba42790ef25c82bb481ecf36e2da892646cccd361e69a6bb881e19398"
 "checksum itertools 0.7.8 (registry+https://github.com/rust-lang/crates.io-index)" = "f58856976b776fedd95533137617a02fb25719f40e7d9b01c7043cd65474f450"
 "checksum itoa 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "c069bbec61e1ca5a596166e55dfe4773ff745c3d16b700013bcaff9a6df2c682"
+"checksum kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7507624b29483431c0ba2d82aece8ca6cdba9382bff4ddd0f7490560c056098d"
 "checksum lazy_static 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "76f033c7ad61445c5b347c7382dd1237847eb1bce590fe50365dcb33d546be73"
 "checksum lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "c8f31047daa365f19be14b47c29df4f7c3b581832407daabe6ae77397619237d"
 "checksum libc 0.2.40 (registry+https://github.com/rust-lang/crates.io-index)" = "6fd41f331ac7c5b8ac259b8bf82c75c0fb2e469bbf37d2becbba9a6a2221965b"
@@ -839,7 +870,9 @@ dependencies = [
 "checksum unreachable 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "382810877fe448991dfc7f0dd6e3ae5d58088fd0ea5e35189655f84e6814fa56"
 "checksum utf8-ranges 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "662fab6525a98beff2921d7f61a39e7d59e0b425ebc7d0d9e66d316e55124122"
 "checksum void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
+"checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
 "checksum winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "04e3bd221fcbe8a271359c04f21a76db7d0c6028862d1bb5512d85e1e2eb5bb3"
+"checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
 "checksum winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
 "checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
 "checksum wincolor 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "eeb06499a3a4d44302791052df005d5232b927ed1a9658146d842165c4de7767"
diff --git a/Cargo.toml b/Cargo.toml
index ec7550e8d9b..369b963a39c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -32,6 +32,7 @@ cargo-fmt = []
 rustfmt-format-diff = []
 
 [dependencies]
+isatty = "0.1"
 itertools = "0.7"
 toml = "0.4"
 serde = "1.0"
@@ -53,9 +54,3 @@ failure = "0.1.1"
 [dev-dependencies]
 assert_cli = "0.6"
 lazy_static = "1.0.0"
-
-[target.'cfg(unix)'.dependencies]
-libc = "0.2.11"
-
-[target.'cfg(windows)'.dependencies]
-winapi = { version = "0.3" }
diff --git a/src/bin/main.rs b/src/bin/main.rs
index 737eaa93670..fad9eeae6bb 100644
--- a/src/bin/main.rs
+++ b/src/bin/main.rs
@@ -28,8 +28,8 @@ use failure::err_msg;
 use getopts::{Matches, Options};
 
 use rustfmt::{
-    checkstyle_footer, checkstyle_header, format_input, load_config, use_colored_tty, CliOptions,
-    Color, Config, EmitMode, ErrorKind, FileLines, FileName, Input, Summary, Verbosity,
+    checkstyle_footer, checkstyle_header, format_input, load_config, CliOptions, Color, Config,
+    EmitMode, ErrorKind, FileLines, FileName, Input, Summary, Verbosity,
 };
 
 fn main() {
@@ -316,7 +316,7 @@ fn format_and_emit_report(input: Input, config: &Config) -> Result<Summary, fail
             if report.has_warnings() {
                 match term::stderr() {
                     Some(ref t)
-                        if use_colored_tty(config.color())
+                        if config.color().use_colored_tty()
                             && t.supports_color()
                             && t.supports_attr(term::Attr::Bold) =>
                     {
diff --git a/src/config/options.rs b/src/config/options.rs
index 9b4b57a7bfd..8d3b332e8e6 100644
--- a/src/config/options.rs
+++ b/src/config/options.rs
@@ -12,6 +12,8 @@ use config::config_type::ConfigType;
 use config::lists::*;
 use config::{Config, FileName};
 
+use isatty::stdout_isatty;
+
 use std::collections::HashSet;
 use std::path::{Path, PathBuf};
 
@@ -191,6 +193,16 @@ configuration_option_enum! { Color:
     Auto,
 }
 
+impl Color {
+    pub fn use_colored_tty(&self) -> bool {
+        match self {
+            Color::Always => true,
+            Color::Never => false,
+            Color::Auto => stdout_isatty(),
+        }
+    }
+}
+
 configuration_option_enum! { Verbosity:
     // Emit more.
     Verbose,
diff --git a/src/lib.rs b/src/lib.rs
index e84d2021f41..38b169c5170 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -19,6 +19,7 @@
 extern crate derive_new;
 extern crate diff;
 extern crate failure;
+extern crate isatty;
 extern crate itertools;
 #[cfg(test)]
 #[macro_use]
@@ -61,7 +62,6 @@ pub use config::summary::Summary;
 pub use config::{
     load_config, CliOptions, Color, Config, EmitMode, FileLines, FileName, Verbosity,
 };
-pub use utils::use_colored_tty;
 
 #[macro_use]
 mod utils;
diff --git a/src/rustfmt_diff.rs b/src/rustfmt_diff.rs
index 33d7febbd64..de52b28c08b 100644
--- a/src/rustfmt_diff.rs
+++ b/src/rustfmt_diff.rs
@@ -13,7 +13,6 @@ use diff;
 use std::collections::VecDeque;
 use std::io;
 use std::io::Write;
-use utils::use_colored_tty;
 
 #[derive(Debug, PartialEq)]
 pub enum DiffLine {
@@ -53,7 +52,7 @@ impl OutputWriter {
     // for colorized output and the capabilities of the terminal.
     pub fn new(color: Color) -> Self {
         if let Some(t) = term::stdout() {
-            if use_colored_tty(color) && t.supports_color() {
+            if color.use_colored_tty() && t.supports_color() {
                 return OutputWriter { terminal: Some(t) };
             }
         }
diff --git a/src/utils.rs b/src/utils.rs
index 961989b3f5d..127a7ddb59e 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -18,7 +18,6 @@ use syntax::ast::{
 use syntax::codemap::{BytePos, Span, NO_EXPANSION};
 use syntax::ptr;
 
-use config::Color;
 use rewrite::RewriteContext;
 use shape::Shape;
 
@@ -376,32 +375,6 @@ pub fn left_most_sub_expr(e: &ast::Expr) -> &ast::Expr {
     }
 }
 
-// isatty shamelessly adapted from cargo.
-#[cfg(unix)]
-pub fn isatty() -> bool {
-    extern crate libc;
-
-    unsafe { libc::isatty(libc::STDOUT_FILENO) != 0 }
-}
-#[cfg(windows)]
-pub fn isatty() -> bool {
-    extern crate winapi;
-
-    unsafe {
-        let handle = winapi::um::processenv::GetStdHandle(winapi::um::winbase::STD_OUTPUT_HANDLE);
-        let mut out = 0;
-        winapi::um::consoleapi::GetConsoleMode(handle, &mut out) != 0
-    }
-}
-
-pub fn use_colored_tty(color: Color) -> bool {
-    match color {
-        Color::Always => true,
-        Color::Never => false,
-        Color::Auto => isatty(),
-    }
-}
-
 pub fn starts_with_newline(s: &str) -> bool {
     s.starts_with('\n') || s.starts_with("\r\n")
 }