diff --git a/src/file_util.rs b/src/file_util.rs
index 8f86a55f..32f99795 100644
--- a/src/file_util.rs
+++ b/src/file_util.rs
@@ -10,15 +10,12 @@ use std::os::unix::io::AsRawFd;
 use std::os::unix::ffi::OsStrExt;
 
 use nix;
-use libc::{uid_t, gid_t, c_int, utime, utimbuf};
+use libc;
+use libc::{uid_t, gid_t, utime, utimbuf, time_t};
 use nix::fcntl::{flock, FlockArg};
 
 use path_util::ToCString;
 
-extern "C" {
-    fn lchown(path: *const i8, owner: uid_t, group: gid_t) -> c_int;
-}
-
 pub struct Lock {
     file: fs::File,
 }
@@ -304,7 +301,7 @@ pub fn set_owner_group(target: &Path, uid: uid_t, gid: gid_t)
     -> Result<(), io::Error>
 {
     let c_target = target.to_cstring();
-    let rc = unsafe { lchown( c_target.as_ptr(), uid, gid) };
+    let rc = unsafe { libc::lchown( c_target.as_ptr(), uid, gid) };
     if rc != 0 {
         warn!("Can't chown {:?}: {}", target, io::Error::last_os_error());
         Ok(())
@@ -471,8 +468,8 @@ pub fn set_times<P: AsRef<Path>>(path: P, atime: i64, mtime: i64)
 {
     let filename = CString::new(path.as_ref().as_os_str().as_bytes()).unwrap();
     let utimes = utimbuf {
-        actime: atime,
-        modtime: mtime,
+        actime: atime as time_t,
+        modtime: mtime as time_t,
     };
     let rc = unsafe { utime(filename.as_ptr(), &utimes) };
     if rc != 0 {