diff --git a/lib/payment-subscription/payment-multi-validator/utils.ak b/lib/payment-subscription/payment-multi-validator/utils.ak
index bc84d76..59fccb1 100644
--- a/lib/payment-subscription/payment-multi-validator/utils.ak
+++ b/lib/payment-subscription/payment-multi-validator/utils.ak
@@ -81,7 +81,7 @@ pub fn validate_extension_datum(
     new_datum.subscription_fee == service_datum.service_fee && new_datum.interval_length == service_datum.interval_length && new_datum.minimum_ada >= service_datum.minimum_ada
 
   let sane_values =
-    new_datum.subscription_start >= 0 && new_datum.subscription_end > new_datum.subscription_start && new_datum.interval_length > 0 && new_datum.interval_amount > 0 && new_datum.num_intervals > 0 && new_datum.minimum_ada > 0
+    new_datum.subscription_start >= 0 && new_datum.subscription_end > new_datum.subscription_start && new_datum.interval_length > 0 && new_datum.interval_amount > 0 && new_datum.num_intervals > 0 && new_datum.minimum_ada >= 0
 
   // Ensure that the subscription start is at least negative interval_length
   let valid_start_time =