diff --git a/src/libcore/core.rs b/src/libcore/core.rs
index 5ef11a4ad4648..35131e561d953 100644
--- a/src/libcore/core.rs
+++ b/src/libcore/core.rs
@@ -12,7 +12,7 @@ pub use WindowsPath = path::WindowsPath;
 pub use PosixPath = path::PosixPath;
 
 pub use tuple::{CopyableTuple, ImmutableTuple, ExtendedTupleOps};
-pub use str::{StrSlice, UniqueStr};
+pub use str::{StrSlice, Trimmable};
 pub use vec::{ConstVector, CopyableVector, ImmutableVector};
 pub use vec::{ImmutableEqVector, ImmutableCopyableVector};
 pub use vec::{MutableVector, MutableCopyableVector};
diff --git a/src/libcore/str.rs b/src/libcore/str.rs
index 3da41ac6abc87..0c722c437ee58 100644
--- a/src/libcore/str.rs
+++ b/src/libcore/str.rs
@@ -2075,14 +2075,14 @@ pub mod raw {
 
 }
 
-pub trait UniqueStr {
+pub trait Trimmable {
     pure fn trim() -> self;
     pure fn trim_left() -> self;
     pure fn trim_right() -> self;
 }
 
 /// Extension methods for strings
-impl ~str: UniqueStr {
+impl ~str: Trimmable {
     /// Returns a string with leading and trailing whitespace removed
     #[inline]
     pure fn trim() -> ~str { trim(self) }