diff --git a/aqt/exporting.py b/aqt/exporting.py
index 588ea1893..805cf9189 100644
--- a/aqt/exporting.py
+++ b/aqt/exporting.py
@@ -72,7 +72,7 @@ class ExportDialog(QDialog):
             deck_name = self.decks[self.frm.deck.currentIndex()]
             deck_name = re.sub('[\\\\/?<>:*|"^]', '_', deck_name)
             filename = os.path.join(aqt.mw.pm.base,
-                                    '{}.apkg'.format(deck_name))
+                                    '{0}{1}'.format(deck_name, self.exporter.ext))
             while 1:
                 file = getSaveFile(self, _("Export"), "export",
                                    self.exporter.key, self.exporter.ext,