1 files changed, 1 insertions, 1 deletions
diff --git a/tokio/tests/io_split.rs b/tokio/tests/io_split.rs
index 7b401424..db168e9f 100644
--- a/tokio/tests/io_split.rs
+++ b/tokio/tests/io_split.rs
@@ -15,7 +15,7 @@ impl AsyncRead for RW {
         _cx: &mut Context<'_>,
         buf: &mut ReadBuf<'_>,
     ) -> Poll<io::Result<()>> {
-        buf.append(&[b'z']);
+        buf.put_slice(&[b'z']);
         Poll::Ready(Ok(()))
     }
 }