diff --git a/src/libcore/marker.rs b/src/libcore/marker.rs
index 39c390b4df6d3..8052d3b4f527e 100644
--- a/src/libcore/marker.rs
+++ b/src/libcore/marker.rs
@@ -431,6 +431,9 @@ macro_rules! impls{
                 $t
             }
         }
+
+        #[stable(feature = "pin", since = "1.33.0")]
+        impl<T:?Sized> Unpin for $t<T> { }
         )
 }