diff --git a/homeassistant/components/webdav/backup.py b/homeassistant/components/webdav/backup.py
index f810547022b..11d0a459852 100644
--- a/homeassistant/components/webdav/backup.py
+++ b/homeassistant/components/webdav/backup.py
@@ -171,6 +171,7 @@ class WebDavBackupAgent(BackupAgent):
             await open_stream(),
             f"{self._backup_path}/{filename_tar}",
             timeout=BACKUP_TIMEOUT,
+            content_length=backup.size,
         )
 
         _LOGGER.debug(