diff --git a/library/core/src/str/converts.rs b/library/core/src/str/converts.rs
index b0c55ca4f5139..5f8748206d764 100644
--- a/library/core/src/str/converts.rs
+++ b/library/core/src/str/converts.rs
@@ -77,7 +77,7 @@ use super::Utf8Error;
 /// let sparkle_heart = [240, 159, 146, 150];
 ///
 /// // We know these bytes are valid, so just use `unwrap()`.
-/// let sparkle_heart = str::from_utf8(&sparkle_heart).unwrap();
+/// let sparkle_heart: &str = str::from_utf8(&sparkle_heart).unwrap();
 ///
 /// assert_eq!("💖", sparkle_heart);
 /// ```