diff --git a/jdav_web/finance/models.py b/jdav_web/finance/models.py
index 83905d7..86d369a 100644
--- a/jdav_web/finance/models.py
+++ b/jdav_web/finance/models.py
@@ -282,7 +282,7 @@ class Statement(CommonModel):
 
     @property
     def total_bills(self):
-        return sum([bill.amount for bill in self.bill_set.all() if bill.costs_covered])
+        return sum([bill.amount for bill in self.bills_covered])
 
     @property
     def bills_covered(self):