diff --git a/hobo/agent/authentic2/role_forms.py b/hobo/agent/authentic2/role_forms.py
index 40608ea..54e7123 100644
--- a/hobo/agent/authentic2/role_forms.py
+++ b/hobo/agent/authentic2/role_forms.py
@@ -39,7 +39,7 @@ class ListValidator(object):
 
 
 class CommaSeparatedInput(forms.TextInput):
-    def _format_value(self, value):
+    def format_value(self, value):
         if not value:
             return ''
         if not isinstance(value, six.string_types):