4 files changed, 7 insertions, 5 deletions
diff --git a/src/librustc_expand/base.rs b/src/librustc_expand/base.rs
index 59c1a5468f1..bbd6bb47fb8 100644
--- a/src/librustc_expand/base.rs
+++ b/src/librustc_expand/base.rs
@@ -1086,7 +1086,7 @@ impl<'a> ExtCtxt<'a> {
         if !path.is_absolute() {
             let callsite = span.source_callsite();
             let mut result = match self.source_map().span_to_unmapped_path(callsite) {
-                FileName::Real(path) => path,
+                FileName::Real(name) => name.into_local_path(),
                 FileName::DocTest(path, _) => path,
                 other => {
                     return Err(self.struct_span_err(
diff --git a/src/librustc_expand/expand.rs b/src/librustc_expand/expand.rs
index 2618c758ca5..39058d229d5 100644
--- a/src/librustc_expand/expand.rs
+++ b/src/librustc_expand/expand.rs
@@ -340,7 +340,7 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
         let mut module = ModuleData {
             mod_path: vec![Ident::from_str(&self.cx.ecfg.crate_name)],
             directory: match self.cx.source_map().span_to_unmapped_path(krate.span) {
-                FileName::Real(path) => path,
+                FileName::Real(name) => name.into_local_path(),
                 other => PathBuf::from(other.to_string()),
             },
         };
diff --git a/src/librustc_expand/module.rs b/src/librustc_expand/module.rs
index aad92a09743..acf986445e5 100644
--- a/src/librustc_expand/module.rs
+++ b/src/librustc_expand/module.rs
@@ -71,7 +71,7 @@ crate fn parse_external_mod(
     // Extract the directory path for submodules of `module`.
     let path = sess.source_map().span_to_unmapped_path(module.inner);
     let mut path = match path {
-        FileName::Real(path) => path,
+        FileName::Real(name) => name.into_local_path(),
         other => PathBuf::from(other.to_string()),
     };
     path.pop();
@@ -189,7 +189,8 @@ fn error_cannot_declare_mod_here<'a, T>(
     let mut err =
         sess.span_diagnostic.struct_span_err(span, "cannot declare a new module at this location");
     if !span.is_dummy() {
-        if let FileName::Real(src_path) = sess.source_map().span_to_filename(span) {
+        if let FileName::Real(src_name) = sess.source_map().span_to_filename(span) {
+            let src_path = src_name.into_local_path();
             if let Some(stem) = src_path.file_stem() {
                 let mut dest_path = src_path.clone();
                 dest_path.set_file_name(stem);
diff --git a/src/librustc_expand/proc_macro_server.rs b/src/librustc_expand/proc_macro_server.rs
index 5f21ff503d5..b26f9caf456 100644
--- a/src/librustc_expand/proc_macro_server.rs
+++ b/src/librustc_expand/proc_macro_server.rs
@@ -596,7 +596,8 @@ impl server::SourceFile for Rustc<'_> {
     }
     fn path(&mut self, file: &Self::SourceFile) -> String {
         match file.name {
-            FileName::Real(ref path) => path
+            FileName::Real(ref name) => name
+                .local_path()
                 .to_str()
                 .expect("non-UTF8 file path in `proc_macro::SourceFile::path`")
                 .to_string(),