diff --git a/library/std/src/error.rs b/library/std/src/error.rs
index d8859cf1e552..a6d36dbe5c79 100644
--- a/library/std/src/error.rs
+++ b/library/std/src/error.rs
@@ -814,7 +814,7 @@ impl dyn Error + Send + Sync {
 ///
 /// # Examples
 ///
-/// ```
+/// ```rust
 /// #![feature(error_reporter)]
 /// #![feature(negative_impls)]
 ///