diff --git a/tests/test_octodns_provider_dnsimple.py b/tests/test_octodns_provider_dnsimple.py
index 975cb26..b918962 100644
--- a/tests/test_octodns_provider_dnsimple.py
+++ b/tests/test_octodns_provider_dnsimple.py
@@ -44,6 +44,7 @@ class TestDnsimpleProvider(TestCase):
         self.assertTrue('sandbox' in provider._client.base)
 
         provider = DnsimpleProvider('test', 'token', 42)
+        self.assertFalse('sandbox' in provider._client.base)
 
         # Bad auth
         with requests_mock() as mock: