diff --git a/bookwyrm/models/fields.py b/bookwyrm/models/fields.py
index 3b369e84..e1c947f4 100644
--- a/bookwyrm/models/fields.py
+++ b/bookwyrm/models/fields.py
@@ -356,7 +356,7 @@ def image_serializer(value, alt):
     else:
         return None
     if not url[:4] == "http":
-        url = "https://{:s}{:s}".format(DOMAIN, url)
+        url = "https://{:s}/{:s}".format(DOMAIN, url)
     return activitypub.Document(url=url, name=alt)
 
 
diff --git a/bookwyrm/tests/models/test_fields.py b/bookwyrm/tests/models/test_fields.py
index caf12b84..0d93d99c 100644
--- a/bookwyrm/tests/models/test_fields.py
+++ b/bookwyrm/tests/models/test_fields.py
@@ -17,7 +17,7 @@ from django.db import models
 from django.test import TestCase
 from django.utils import timezone
 
-from bookwyrm import activitypub, settings
+from bookwyrm import activitypub
 from bookwyrm.activitypub.base_activity import ActivityObject
 from bookwyrm.models import fields, User, Status
 from bookwyrm.models.base_model import BookWyrmModel