diff --git a/src/libproc_macro/lib.rs b/src/libproc_macro/lib.rs
index 1a0dde3ccd7c3..d885f9b406f59 100644
--- a/src/libproc_macro/lib.rs
+++ b/src/libproc_macro/lib.rs
@@ -48,7 +48,7 @@ pub mod rustc;
 mod diagnostic;
 
 #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
-pub use diagnostic::{Diagnostic, Level};
+pub use diagnostic::{Diagnostic, Level, MultiSpan};
 
 use std::{ascii, fmt, iter};
 use std::path::PathBuf;