--- a/src/clircle_unix.rs
+++ b/src/clircle_unix.rs
@@ -4,7 +4,7 @@ use std::convert::TryFrom;
 use std::fs::File;
 use std::io::{self, Seek};
 use std::os::unix::fs::MetadataExt;
-use std::os::unix::io::{FromRawFd, IntoRawFd, RawFd};
+use std::os::unix::io::{AsRawFd,FromRawFd, IntoRawFd, RawFd};
 use std::{cmp, hash, ops};
 
 /// Re-export of libc
@@ -186,7 +186,7 @@ mod tests {
     #[test]
     fn test_pty_equal_but_not_conflicting() -> Result<(), &'static str> {
         let OpenptyResult { master, slave } = openpty(None, None).expect("Could not open pty.");
-        let res = unsafe { UnixIdentifier::try_from_raw_fd(slave, false) }
+        let res = unsafe { UnixIdentifier::try_from_raw_fd(slave.as_raw_fd(), false) }
             .map_err(|_| "Error creating UnixIdentifier from pty fd")
             .and_then(|ident| {
                 if !ident.eq(&ident) {
@@ -196,7 +196,7 @@ mod tests {
                     return Err("pty fd does not conflict with itself, but conflict detected");
                 }
 
-                let second_ident = unsafe { UnixIdentifier::try_from_raw_fd(slave, false) }
+                let second_ident = unsafe { UnixIdentifier::try_from_raw_fd(slave.as_raw_fd(), false) }
                     .map_err(|_| "Error creating second Identifier to pty")?;
                 if !ident.eq(&second_ident) {
                     return Err("ident != second_ident");
@@ -209,8 +209,8 @@ mod tests {
                 Ok(())
             });
 
-        let r1 = close(master);
-        let r2 = close(slave);
+        let r1 = close(master.as_raw_fd());
+        let r2 = close(slave.as_raw_fd());
 
         r1.expect("Error closing master end of pty");
         r2.expect("Error closing slave end of pty");