diff --git a/src/api2/tape/restore.rs b/src/api2/tape/restore.rs
index 93a6053b..2cc1baab 100644
--- a/src/api2/tape/restore.rs
+++ b/src/api2/tape/restore.rs
@@ -1711,6 +1711,7 @@ fn try_restore_snapshot_archive<R: pxar::decoder::SeqRead>(
             let mut tmpfile = std::fs::OpenOptions::new()
                 .write(true)
                 .create(true)
+                .truncate(true)
                 .read(true)
                 .open(&tmp_path)
                 .map_err(|err| format_err!("restore {:?} failed - {}", tmp_path, err))?;
diff --git a/src/server/sync.rs b/src/server/sync.rs
index 5e3fbdcd..4dd46c5a 100644
--- a/src/server/sync.rs
+++ b/src/server/sync.rs
@@ -159,6 +159,7 @@ impl SyncSourceReader for RemoteSourceReader {
         let tmpfile = std::fs::OpenOptions::new()
             .write(true)
             .create(true)
+            .truncate(true)
             .read(true)
             .open(&tmp_path)?;