diff --git a/aleksis/apps/paweljong/models.py b/aleksis/apps/paweljong/models.py
index efe0f79a4b0c82621b8a3e8ea3b190eaf9d0860e..7954979455e5d76a5b9f6a340fd8d369f6daee47 100644
--- a/aleksis/apps/paweljong/models.py
+++ b/aleksis/apps/paweljong/models.py
@@ -322,7 +322,7 @@ class EventRegistration(ExtensibleModel):
             yield PurchasedItem(
                 name=_("Social Sponsoring / Extra Donation"),
                 quantity=1,
-                price=self.donation,
+                price=Decimal(self.donation),
                 currency="EUR",
                 sku="DONAT",
                 tax_rate=0,
@@ -333,7 +333,7 @@ class EventRegistration(ExtensibleModel):
             yield PurchasedItem(
                 name=_("Voucher / Granted discount"),
                 quantity=1,
-                price=-1 * self.voucher.discount * (self.event.cost / 1.07) / 100,
+                price=Decimal(-1 * self.voucher.discount * (self.event.cost / 1.07) / 100),
                 currency="EUR",
                 sku="DISCO",
                 tax_rate=7,