diff --git a/flask/helpers.py b/flask/helpers.py
index 1febbc5c..fd072ba1 100644
--- a/flask/helpers.py
+++ b/flask/helpers.py
@@ -559,7 +559,7 @@ def send_file(filename_or_fp, mimetype=None, as_attachment=False,
         rv.cache_control.max_age = cache_timeout
         rv.expires = int(time() + cache_timeout)
 
-    if add_etags and filename is not None and file is None:
+    if add_etags and filename is not None:
         from warnings import warn
 
         try: