diff --git a/src/libcore/default.rs b/src/libcore/default.rs
index 0fcc02aae0d2b..70780515dec9d 100644
--- a/src/libcore/default.rs
+++ b/src/libcore/default.rs
@@ -10,6 +10,8 @@
 
 //! The `Default` trait for types which may have meaningful default values
 
+#![stable]
+
 /// A trait that types which have a useful default value should implement.
 pub trait Default {
     /// Return the "default value" for a type.