diff --git a/compiler/rustc_feature/src/builtin_attrs.rs b/compiler/rustc_feature/src/builtin_attrs.rs
index 8eb9bf158290..b2ada8fe61ef 100644
--- a/compiler/rustc_feature/src/builtin_attrs.rs
+++ b/compiler/rustc_feature/src/builtin_attrs.rs
@@ -743,7 +743,7 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
     rustc_attr!(
         rustc_autodiff, Normal,
         template!(Word, List: r#""...""#), DuplicatesOk,
-        EncodeCrossCrate::No, INTERNAL_UNSTABLE
+        EncodeCrossCrate::Yes, INTERNAL_UNSTABLE
     ),
 
     // ==========================================================================