diff --git a/src/sys/unix/attr.rs b/src/sys/unix/attr.rs
index d25e942..a83e6c1 100644
--- a/src/sys/unix/attr.rs
+++ b/src/sys/unix/attr.rs
@@ -1,29 +1,19 @@
 use std::{io, mem};
 
 use super::{cvt, Termios};
-use super::libc::c_int;
 
 pub fn get_terminal_attr() -> io::Result<Termios> {
-    extern "C" {
-        pub fn tcgetattr(fd: c_int, termptr: *mut Termios) -> c_int;
-    }
     unsafe {
         let mut termios = mem::zeroed();
-        cvt(tcgetattr(1, &mut termios))?;
+        cvt(libc::tcgetattr(libc::STDOUT_FILENO, &mut termios))?;
         Ok(termios)
     }
 }
 
 pub fn set_terminal_attr(termios: &Termios) -> io::Result<()> {
-    extern "C" {
-        pub fn tcsetattr(fd: c_int, opt: c_int, termptr: *const Termios) -> c_int;
-    }
-    cvt(unsafe { tcsetattr(1, 0, termios) }).and(Ok(()))
+    cvt(unsafe { libc::tcsetattr(libc::STDOUT_FILENO, libc::TCSANOW, termios) }).and(Ok(()))
 }
 
 pub fn raw_terminal_attr(termios: &mut Termios) {
-    extern "C" {
-        pub fn cfmakeraw(termptr: *mut Termios);
-    }
-    unsafe { cfmakeraw(termios) }
+    unsafe { libc::cfmakeraw(termios) }
 }