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-rw-r--r--src/libcore/borrow.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libcore/borrow.rs b/src/libcore/borrow.rs
index 31631355422..11f5e593462 100644
--- a/src/libcore/borrow.rs
+++ b/src/libcore/borrow.rs
@@ -248,6 +248,7 @@ impl<'a, T, B: ?Sized> PartialOrd for Cow<'a, T, B> where B: PartialOrd + ToOwne
     }
 }
 
+#[stable]
 impl<'a, T, B: ?Sized> fmt::String for Cow<'a, T, B> where
     B: fmt::String + ToOwned<T>,
     T: fmt::String,