diff --git a/library/core/src/convert/mod.rs b/library/core/src/convert/mod.rs
index c42adda8da545..5139f844ee2d4 100644
--- a/library/core/src/convert/mod.rs
+++ b/library/core/src/convert/mod.rs
@@ -553,6 +553,7 @@ where
     ///
     /// That is, this conversion is whatever the implementation of
     /// <code>[From]&lt;T&gt; for U</code> chooses to do.
+    #[inline]
     fn into(self) -> U {
         U::from(self)
     }