diff --git a/src/base.rs b/src/base.rs
index ecd1e79..8258e0d 100644
--- a/src/base.rs
+++ b/src/base.rs
@@ -35,6 +35,7 @@ pub type CFOptionFlags = u32;
 
 #[allow(dead_code)]
 #[repr(C)]
+#[deriving(Copy)]
 pub struct CFRange {
     location: CFIndex,
     length: CFIndex