diff --git a/aqt/importing.py b/aqt/importing.py
index 3410f4c63..0639215ec 100644
--- a/aqt/importing.py
+++ b/aqt/importing.py
@@ -281,7 +281,7 @@ def importFile(mw, file):
         except Exception, e:
             msg = unicode(e)
             if msg == "unknownFormat":
-                if ext == ".anki2":
+                if file.endswith(".anki2"):
                     showWarning(_("""\
 .anki2 files are not designed for importing. If you're trying to restore from a \
 backup, please see the 'Backups' section of the user manual."""))