diff --git a/django_distill/backends/amazon_s3.py b/django_distill/backends/amazon_s3.py
index d26ed14..7e56015 100644
--- a/django_distill/backends/amazon_s3.py
+++ b/django_distill/backends/amazon_s3.py
@@ -34,7 +34,7 @@ def account_container(self):
     def authenticate(self, calling_format=None):
         access_key_id = self.account_username()
         secret_access_key = self.options.get('SECRET_ACCESS_KEY', '')
-        endpoint_url = self.options.get('ENDPOINT_URL', '')
+        endpoint_url = self.options.get('ENDPOINT_URL', None)
         bucket = self.account_container()
         if access_key_id and secret_access_key:
             self.d['connection'] = boto3.client('s3', aws_access_key_id=access_key_id,