diff --git a/bookwyrm/settings.py b/bookwyrm/settings.py
index 16241f9df..4cecc4df6 100644
--- a/bookwyrm/settings.py
+++ b/bookwyrm/settings.py
@@ -366,9 +366,9 @@ if USE_S3:
     AWS_ACCESS_KEY_ID = env("AWS_ACCESS_KEY_ID")
     AWS_SECRET_ACCESS_KEY = env("AWS_SECRET_ACCESS_KEY")
     AWS_STORAGE_BUCKET_NAME = env("AWS_STORAGE_BUCKET_NAME")
-    AWS_S3_CUSTOM_DOMAIN = env("AWS_S3_CUSTOM_DOMAIN")
+    AWS_S3_CUSTOM_DOMAIN = env("AWS_S3_CUSTOM_DOMAIN", None)
     AWS_S3_REGION_NAME = env("AWS_S3_REGION_NAME", "")
-    AWS_S3_ENDPOINT_URL = env("AWS_S3_ENDPOINT_URL")
+    AWS_S3_ENDPOINT_URL = env("AWS_S3_ENDPOINT_URL", None)
     AWS_DEFAULT_ACL = "public-read"
     AWS_S3_OBJECT_PARAMETERS = {"CacheControl": "max-age=86400"}
     # S3 Static settings