1 files changed, 2 insertions, 1 deletions
diff --git a/src/libsyntax/ext/proc_macro_server.rs b/src/libsyntax/ext/proc_macro_server.rs
index 021ec46d987..3ed6f4114ae 100644
--- a/src/libsyntax/ext/proc_macro_server.rs
+++ b/src/libsyntax/ext/proc_macro_server.rs
@@ -2,6 +2,7 @@ use crate::ast;
 use crate::ext::base::ExtCtxt;
 use crate::parse::{self, token, ParseSess};
 use crate::parse::lexer::comments;
+use crate::print::pprust;
 use crate::tokenstream::{self, DelimSpan, IsJoint::*, TokenStream, TreeAndJoint};
 
 use errors::Diagnostic;
@@ -407,7 +408,7 @@ impl server::TokenStream for Rustc<'_> {
         )
     }
     fn to_string(&mut self, stream: &Self::TokenStream) -> String {
-        stream.to_string()
+        pprust::tts_to_string(stream.clone())
     }
     fn from_token_tree(
         &mut self,