diff --git a/test/test_unistd.rs b/test/test_unistd.rs
index ffce18506a..5a1b5c87d1 100644
--- a/test/test_unistd.rs
+++ b/test/test_unistd.rs
@@ -138,14 +138,11 @@ fn test_lseek() {
 #[cfg(any(target_os = "linux", target_os = "android"))]
 #[test]
 fn test_lseek64() {
-    use libc::off_t;
-
     const CONTENTS: &'static [u8] = b"abcdef123456";
     let mut tmp = tempfile().unwrap();
     tmp.write(CONTENTS).unwrap();
 
-    let offset: libc::off64_t = 5;
-    lseek64(tmp.as_raw_fd(), offset, Whence::SeekSet).unwrap();
+    lseek64(tmp.as_raw_fd(), 5, Whence::SeekSet).unwrap();
 
     let mut buf = String::new();
      tmp.read_to_string(&mut buf).unwrap();