diff --git a/library/alloc/src/str.rs b/library/alloc/src/str.rs
index 26c1ba2a5c4..6fee8d3fe33 100644
--- a/library/alloc/src/str.rs
+++ b/library/alloc/src/str.rs
@@ -531,6 +531,7 @@ pub fn into_string(self: Box<str>) -> String {
     #[rustc_allow_incoherent_impl]
     #[must_use]
     #[stable(feature = "repeat_str", since = "1.16.0")]
+    #[inline]
     pub fn repeat(&self, n: usize) -> String {
         unsafe { String::from_utf8_unchecked(self.as_bytes().repeat(n)) }
     }