diff --git a/src/tools/tidy/src/ui_tests.rs b/src/tools/tidy/src/ui_tests.rs
index a9c5be913ba1e..1a53637ad42f9 100644
--- a/src/tools/tidy/src/ui_tests.rs
+++ b/src/tools/tidy/src/ui_tests.rs
@@ -190,7 +190,11 @@ pub fn check(path: &Path, bless: bool, bad: &mut bool) {
         let blessed_issues_path = tidy_src.join("issues_blessed.txt");
         let mut blessed_issues_txt = fs::File::create(&blessed_issues_path).unwrap();
         blessed_issues_txt.write(issues_txt_header.as_bytes()).unwrap();
-        for filename in allowed_issue_names.difference(&remaining_issue_names) {
+        // If we changed paths to use the OS separator, reassert Unix chauvinism for blessing.
+        for filename in allowed_issue_names
+            .difference(&remaining_issue_names)
+            .map(|s| s.replace(std::path::MAIN_SEPARATOR_STR, "/"))
+        {
             write!(blessed_issues_txt, "\"{filename}\",\n").unwrap();
         }
         write!(blessed_issues_txt, "]\n").unwrap();