diff --git a/wo/core/domainvalidate.py b/wo/core/domainvalidate.py
index a787480..f8dc5c3 100644
--- a/wo/core/domainvalidate.py
+++ b/wo/core/domainvalidate.py
@@ -3,7 +3,7 @@ import os
 from urllib.parse import urlparse
 
 
-class DOMN:
+class DOMN():
 
     def validatedomain(self, url):
         """