diff --git a/src/tools/compiletest/src/runtest.rs b/src/tools/compiletest/src/runtest.rs
index f6e8fdd62443..1f15605d8bee 100644
--- a/src/tools/compiletest/src/runtest.rs
+++ b/src/tools/compiletest/src/runtest.rs
@@ -2731,6 +2731,7 @@ fn compare_to_default_rustdoc(&mut self, out_dir: &Path) {
 
         #[rustfmt::skip]
         let tidy_args = [
+            "--new-blocklevel-tags", "rustdoc-search",
             "--indent", "yes",
             "--indent-spaces", "2",
             "--wrap", "0",