diff --git a/registrasion/tests/test_voucher.py b/registrasion/tests/test_voucher.py
index 1502c2fc9a609f180cb86c0dfd53e2fed657292a..a8686fb1d7c3535edad075be0c0e0b5788318e77 100644
--- a/registrasion/tests/test_voucher.py
+++ b/registrasion/tests/test_voucher.py
@@ -34,8 +34,8 @@ class VoucherTestCases(RegistrationCartTestCase):
         # user 2 should be able to apply voucher
         self.add_timedelta(rego.Voucher.RESERVATION_DURATION * 2)
         cart_2.apply_voucher(voucher.code)
-        cart_2.cart.active = False
-        cart_2.cart.save()
+
+        cart_2.next_cart()
 
         # After the reservation duration, even though the voucher has applied,
         # it exceeds the number of vouchers available.
@@ -125,8 +125,8 @@ class VoucherTestCases(RegistrationCartTestCase):
         current_cart = TestingCartController.for_user(self.USER_1)
         current_cart.apply_voucher(voucher.code)
 
-        current_cart.cart.active = False
-        current_cart.cart.save()
+
+        current_cart.next_cart()
 
         current_cart = TestingCartController.for_user(self.USER_1)