diff --git a/examples/reporter_demo.py b/examples/reporter_demo.py
index 41c03df..d98c299 100644
--- a/examples/reporter_demo.py
+++ b/examples/reporter_demo.py
@@ -73,7 +73,14 @@ def __init__(self, index):
     def identify(self, requirement_or_candidate):
         return requirement_or_candidate.name
 
-    def get_preference(self, identifier, resolutions, candidates, information):
+    def get_preference(
+        self,
+        identifier,
+        resolutions,
+        candidates,
+        information,
+        backtrack_causes,
+    ):
         return sum(1 for _ in candidates[identifier])
 
     def find_matches(self, identifier, requirements, incompatibilities):