diff --git a/src/directory/mmap_directory.rs b/src/directory/mmap_directory.rs
index 7419cbe49..95c767982 100644
--- a/src/directory/mmap_directory.rs
+++ b/src/directory/mmap_directory.rs
@@ -1,7 +1,7 @@
 use std::collections::HashMap;
 use std::fmt;
 use std::fs::{self, File, OpenOptions};
-use std::io::{self, BufWriter, Read, Seek, Write};
+use std::io::{self, BufWriter, Read, Write};
 use std::ops::Deref;
 use std::path::{Path, PathBuf};
 use std::sync::{Arc, RwLock, Weak};
@@ -328,12 +328,6 @@ impl Write for SafeFileWriter {
     }
 }
 
-impl Seek for SafeFileWriter {
-    fn seek(&mut self, pos: io::SeekFrom) -> io::Result<u64> {
-        self.0.seek(pos)
-    }
-}
-
 impl TerminatingWrite for SafeFileWriter {
     fn terminate_ref(&mut self, _: AntiCallToken) -> io::Result<()> {
         self.0.flush()?;
diff --git a/src/directory/ram_directory.rs b/src/directory/ram_directory.rs
index 56e9e3648..a7a29b15c 100644
--- a/src/directory/ram_directory.rs
+++ b/src/directory/ram_directory.rs
@@ -1,5 +1,5 @@
 use std::collections::HashMap;
-use std::io::{self, BufWriter, Cursor, Seek, SeekFrom, Write};
+use std::io::{self, BufWriter, Cursor, Write};
 use std::path::{Path, PathBuf};
 use std::sync::{Arc, RwLock};
 use std::{fmt, result};
@@ -48,12 +48,6 @@ impl Drop for VecWriter {
     }
 }
 
-impl Seek for VecWriter {
-    fn seek(&mut self, pos: SeekFrom) -> io::Result<u64> {
-        self.data.seek(pos)
-    }
-}
-
 impl Write for VecWriter {
     fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
         self.is_flushed = false;