diff --git a/opal/core/search/extract_serialisers.py b/opal/core/search/extract_serialisers.py
index 6828fed2d..fae9ccbfe 100644
--- a/opal/core/search/extract_serialisers.py
+++ b/opal/core/search/extract_serialisers.py
@@ -46,9 +46,6 @@ def __init__(self, name, value=None, display_name=None, description=None):
         else:
             self.display_name = self.name.title()
 
-    def to_schema(self):
-        pass
-
 
 class CsvRenderer(object):
     """