diff --git a/examples/ls.rs b/examples/ls.rs
index 6fe38bb..0b9a5d3 100644
--- a/examples/ls.rs
+++ b/examples/ls.rs
@@ -4,7 +4,6 @@ extern crate chrono;
 use std::env;
 use std::fs::File;
 use std::io::BufReader;
-use std::str;
 use chrono::{DateTime, Local};
 
 use fatfs::FileSystem;
diff --git a/src/fs.rs b/src/fs.rs
index dcb35b3..5e68068 100644
--- a/src/fs.rs
+++ b/src/fs.rs
@@ -87,8 +87,8 @@ pub struct FileSystem<'a> {
 
 impl <'a> FileSystem<'a> {
     
-    pub fn new<T: ReadSeek>(mut rdr: &'a mut T) -> io::Result<FileSystem<'a>> {
-        let boot = Self::read_boot_record(&mut *rdr)?;
+    pub fn new<T: ReadSeek>(rdr: &'a mut T) -> io::Result<FileSystem<'a>> {
+        let boot = Self::read_boot_record(rdr)?;
         if boot.boot_sig != [0x55, 0xAA] {
             return Err(Error::new(ErrorKind::Other, "invalid signature"));
         }