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-rw-r--r--compiler/rustc_macros/src/lib.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/rustc_macros/src/lib.rs b/compiler/rustc_macros/src/lib.rs
index a2a01b66690..ac916bb6068 100644
--- a/compiler/rustc_macros/src/lib.rs
+++ b/compiler/rustc_macros/src/lib.rs
@@ -48,7 +48,7 @@ pub fn symbols(input: TokenStream) -> TokenStream {
 /// `u32::MAX`. You can also customize things like the `Debug` impl,
 /// what traits are derived, and so forth via the macro.
 #[proc_macro]
-#[allow_internal_unstable(step_trait, rustc_attrs, trusted_step)]
+#[allow_internal_unstable(step_trait, rustc_attrs, trusted_step, spec_option_partial_eq)]
 pub fn newtype_index(input: TokenStream) -> TokenStream {
     newtype::newtype(input)
 }