diff --git a/filter_plugins/domain_relative_to.py b/filter_plugins/domain_relative_to.py
index 72a75e8..2fe2b3f 100644
--- a/filter_plugins/domain_relative_to.py
+++ b/filter_plugins/domain_relative_to.py
@@ -1,4 +1,4 @@
-def domain_relative_to(domain):
+def domain_relative_to(domain, zone):
     if domain == '@':
         return zone
     if domain[-1] != '.':