1 files changed, 2 insertions, 2 deletions
diff --git a/src/libcore/nonzero.rs b/src/libcore/nonzero.rs
index 1231e1ab894..495c7c2bc2e 100644
--- a/src/libcore/nonzero.rs
+++ b/src/libcore/nonzero.rs
@@ -32,7 +32,7 @@ unsafe impl Zeroable for u64 {}
 /// NULL or 0 that might allow certain optimizations.
 #[lang="non_zero"]
 #[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Show, Hash)]
-#[unstable]
+#[unstable(feature = "core")]
 pub struct NonZero<T: Zeroable>(T);
 
 impl<T: Zeroable> NonZero<T> {
@@ -52,4 +52,4 @@ impl<T: Zeroable> Deref for NonZero<T> {
         let NonZero(ref inner) = *self;
         inner
     }
-}
\ No newline at end of file
+}