diff --git a/hptp-recv/src/main.rs b/hptp-recv/src/main.rs
index 819f809..bc5f142 100644
--- a/hptp-recv/src/main.rs
+++ b/hptp-recv/src/main.rs
@@ -170,8 +170,9 @@ where
 
         let num_acks = if sink.is_file_complete() { 8 } else { 1 };
         for _ in 0..num_acks {
+            let idxs = sink.ack_idxs();
             log.debug_msg(format!("send acks {:?}", idxs)).await;
-            let m = DownMsg::Ack { idxs: sink.ack_idxs() };
+            let m = DownMsg::Ack { idxs };
             match peer.send(m).await {
                 Ok(()) => (),
                 Err(hptp::peer::SendError::NoTarget) => log.debug_msg("no target").await,