diff --git a/modules/ui_tempdir.py b/modules/ui_tempdir.py
index 9fc7d764..fb75137e 100644
--- a/modules/ui_tempdir.py
+++ b/modules/ui_tempdir.py
@@ -31,7 +31,7 @@ def check_tmp_file(gradio, filename):
     return False
 
 
-def save_pil_to_file(self, pil_image, dir=None):
+def save_pil_to_file(self, pil_image, dir=None, format="png"):
     already_saved_as = getattr(pil_image, 'already_saved_as', None)
     if already_saved_as and os.path.isfile(already_saved_as):
         register_tmp_file(shared.demo, already_saved_as)