diff --git a/webcompat/api/uploads.py b/webcompat/api/uploads.py
index 055969c9b..e8d240996 100644
--- a/webcompat/api/uploads.py
+++ b/webcompat/api/uploads.py
@@ -86,6 +86,8 @@ def save(self):
         # Optimize further the image compression for these formats
         if self.image_object.format in ['JPEG', 'JPG', 'JPE', 'PNG']:
             save_parameters['optimize'] = True
+            # Convert PNG to JPEG. See issue #1051
+            file_dest = 'jpg'.join(file_dest.rsplit('png', 1))
         # If animated GIF, aka duration > 0, add save_all parameter
         if (self.image_object.format == 'GIF' and
            self.image_object.info['duration'] > 0):