diff --git a/chicago/bills.py b/chicago/bills.py
index 4708dfe..62ef77b 100644
--- a/chicago/bills.py
+++ b/chicago/bills.py
@@ -300,7 +300,7 @@ def scrape(self, window=3):
                     relation_type = "replaces"
 
                 if relation_type is None:
-                    self.warn("Unclear relation for {0}".format(matter_id))
+                    self.warning("Unclear relation for {0}".format(matter_id))
 
                 else:
                     for relation in identified_relations: