diff --git a/troveclient/v1/client.py b/troveclient/v1/client.py
index af50b870..0da54bef 100644
--- a/troveclient/v1/client.py
+++ b/troveclient/v1/client.py
@@ -48,7 +48,8 @@ class Client(object):
 
     """
 
-    def __init__(self, username, password, project_id=None, auth_url='',
+    def __init__(self, username=None, password=None, project_id=None,
+                 auth_url='',
                  insecure=False, timeout=None, tenant_id=None,
                  proxy_tenant_id=None, proxy_token=None, region_name=None,
                  endpoint_type='publicURL', extensions=None,