diff --git a/src/librustc/middle/cstore.rs b/src/librustc/middle/cstore.rs
index 5a580dfa420b3..d37b2367ae77e 100644
--- a/src/librustc/middle/cstore.rs
+++ b/src/librustc/middle/cstore.rs
@@ -87,7 +87,7 @@ pub enum LinkagePreference {
     RequireStatic,
 }
 
-#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash,
+#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash,
          RustcEncodable, RustcDecodable, HashStable)]
 pub enum NativeLibraryKind {
     /// native static library (.a archive)
@@ -100,7 +100,7 @@ pub enum NativeLibraryKind {
     NativeUnknown,
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, HashStable)]
+#[derive(Clone, Debug, RustcEncodable, RustcDecodable, HashStable)]
 pub struct NativeLibrary {
     pub kind: NativeLibraryKind,
     pub name: Option<Symbol>,