diff --git a/keystoneclient/shell.py b/keystoneclient/shell.py
index 3aebaddb0..5caadeb45 100644
--- a/keystoneclient/shell.py
+++ b/keystoneclient/shell.py
@@ -384,6 +384,8 @@ class OpenStackIdentityShell(object):
 
         if args.debug:
             logging_level = logging.DEBUG
+            iso_logger = logging.getLogger('iso8601')
+            iso_logger.setLevel('WARN')
         else:
             logging_level = logging.WARNING