diff --git a/ihdad/src/HDA/device.rs b/ihdad/src/HDA/device.rs
index 3a35d0ff70..64774ea760 100755
--- a/ihdad/src/HDA/device.rs
+++ b/ihdad/src/HDA/device.rs
@@ -16,7 +16,8 @@ extern crate syscall;
 
 use syscall::MAP_WRITE;
 use syscall::error::{Error, EACCES, EBADF, Result, EINVAL};
-use syscall::io::{ Mmio, Io};
+use syscall::flag::{SEEK_SET, SEEK_CUR, SEEK_END};
+use syscall::io::{Mmio, Io};
 use syscall::scheme::SchemeMut;
 
 use spin::Mutex;
@@ -1029,4 +1030,4 @@ impl SchemeMut for IntelHDA {
         	handles.remove(&_id).ok_or(Error::new(EBADF)).and(Ok(0))
     	}
 
-}
\ No newline at end of file
+}