diff --git a/src/lib.rs b/src/lib.rs
index 51eb56a..32e5e56 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -10,7 +10,6 @@ use std::cmp::Ordering;
 use std::fmt;
 use std::i32;
 use std::i64;
-use std::marker::MarkerTrait;
 use std::marker::PhantomData;
 
 use time::Timespec;
@@ -152,7 +151,7 @@ impl Normalizable for Timespec {
 }
 
 /// The possible sides of a bound
-#[derive(PartialEq, Eq, Copy)]
+#[derive(PartialEq, Eq, Clone, Copy)]
 pub enum BoundSide {
     /// An upper bound
     Upper,
@@ -162,7 +161,7 @@ pub enum BoundSide {
 
 /// A trait implemented by phantom types indicating the type of the bound
 #[doc(hidden)]
-pub trait BoundSided: MarkerTrait {
+pub trait BoundSided {
     /// Returns the bound side this type corresponds to
     fn side() -> BoundSide;
 }