diff --git a/src/librustc_data_structures/sync.rs b/src/librustc_data_structures/sync.rs
index 7668225627f..d4c6b1c2ced 100644
--- a/src/librustc_data_structures/sync.rs
+++ b/src/librustc_data_structures/sync.rs
@@ -268,7 +268,7 @@ cfg_if! {
             t.into_par_iter()
         }
 
-        pub type MetadataRef = OwningRef<Box<Erased + Send + Sync>, [u8]>;
+        pub type MetadataRef = OwningRef<Box<dyn Erased + Send + Sync>, [u8]>;
 
         /// This makes locks panic if they are already held.
         /// It is only useful when you are running in a single thread