diff --git a/src/pretix/base/migrations/0211_auto_20220314_2001.py b/src/pretix/base/migrations/0211_auto_20220314_2001.py
index 58e5c315d..dce041c0a 100644
--- a/src/pretix/base/migrations/0211_auto_20220314_2001.py
+++ b/src/pretix/base/migrations/0211_auto_20220314_2001.py
@@ -11,7 +11,7 @@ def migrate_voucher_budget_use(apps, schema_editor):
     OrderPosition.all.filter(
         price_before_voucher__isnull=False
     ).exclude(price=F('price_before_voucher')).update(
-        voucher_budget_use=Greatest(F('price') - F('price_before_voucher'), Decimal('0.00'))
+        voucher_budget_use=Greatest(F('price_before_voucher') - F('price'), Decimal('0.00'))
     )