diff --git a/betterforms/changelist.py b/betterforms/changelist.py
index 425708a..946dc4d 100644
--- a/betterforms/changelist.py
+++ b/betterforms/changelist.py
@@ -312,7 +312,7 @@ def get_results(self):
 
     def __init__(self, *args, **kwargs):
         super(SortFormBase, self).__init__(*args, **kwargs)
-        self.headers = HeaderSet(self, self.HEADERS)
+        self.headers = self.HeaderSetClass(self, self.HEADERS)
 
     def clean_sorts(self):
         cleaned_data = self.cleaned_data