diff --git a/library/core/src/iter/traits/collect.rs b/library/core/src/iter/traits/collect.rs
index e2a407509b1..348e1f7e3f2 100644
--- a/library/core/src/iter/traits/collect.rs
+++ b/library/core/src/iter/traits/collect.rs
@@ -238,6 +238,7 @@ impl<I: Iterator> IntoIterator for I {
     type Item = I::Item;
     type IntoIter = I;
 
+    #[inline]
     fn into_iter(self) -> I {
         self
     }