diff --git a/validate_email.py b/validate_email.py
index 6d945a8..63bee63 100644
--- a/validate_email.py
+++ b/validate_email.py
@@ -26,7 +26,7 @@ try:
     import DNS
     ServerError = DNS.ServerError
     DNS.DiscoverNameServers()
-except ImportError:
+except (ImportError, AttributeError):
     DNS = None
 
     class ServerError(Exception):