diff --git a/quantumclient/client.py b/quantumclient/client.py
index 7a61c68d7..1a058f9f9 100644
--- a/quantumclient/client.py
+++ b/quantumclient/client.py
@@ -135,9 +135,11 @@ def _cs_request(self, *args, **kwargs):
         return resp, body
 
     def do_request(self, url, method, **kwargs):
+        
         if not self.endpoint_url:
             self.authenticate()
-
+        else:
+            self.auth_token=None
         # Perform the request once. If we get a 401 back then it
         # might be because the auth token expired, so try to
         # re-authenticate and try again. If it still fails, bail.