diff --git a/src/libstd/ffi/os_str.rs b/src/libstd/ffi/os_str.rs
index e7558c3c0226..cfa9ecca0191 100644
--- a/src/libstd/ffi/os_str.rs
+++ b/src/libstd/ffi/os_str.rs
@@ -10,7 +10,6 @@
 
 use borrow::{Borrow, Cow};
 use fmt;
-use mem;
 use ops;
 use cmp;
 use hash::{Hash, Hasher};