diff --git a/db/schema.sql b/db/schema.sql
index d78adee..0baef5a 100644
--- a/db/schema.sql
+++ b/db/schema.sql
@@ -778,7 +778,7 @@ CREATE TABLE `pmgr_charges` (
   `charge_type_id`       INT(10) UNSIGNED NOT NULL,
   `lease_id`             INT(10) UNSIGNED NOT NULL,
   `charge_date`          DATE NOT NULL,
-  `charge_to_date`       DATE NOT NULL,
+  `charge_to_date`       DATE DEFAULT NULL,
   `due_date`             DATE DEFAULT NULL,
   `amount`               FLOAT(12,2) NOT NULL,
   `tax`                  FLOAT(12,2) NOT NULL,