diff --git a/bookwyrm/models/user.py b/bookwyrm/models/user.py
index 529df49d..0673f53f 100644
--- a/bookwyrm/models/user.py
+++ b/bookwyrm/models/user.py
@@ -85,7 +85,7 @@ class User(OrderedCollectionPageMixin, AbstractUser):
             # TODO not the right way to get the media type
             media_type = 'image/%s' % url.split('.')[-1]
         else:
-            url = '%s/static/images/default_avi.jpg' % DOMAIN
+            url = 'https://%s/static/images/default_avi.jpg' % DOMAIN
             media_type = 'image/jpeg'
         return activitypub.Image(media_type, url, 'Image')