diff --git a/src/pretix/base/payment.py b/src/pretix/base/payment.py
index 03abf8e0d..122169944 100644
--- a/src/pretix/base/payment.py
+++ b/src/pretix/base/payment.py
@@ -750,7 +750,10 @@ class OffsettingProvider(BasePaymentProvider):
 
     def execute_refund(self, refund: OrderRefund):
         code = refund.info_data['orders'][0]
-        order = self.event.orders.get(code=code)
+        try:
+            order = Order.objects.get(code=code, event__organizer=self.event.organizer)
+        except Order.DoesNotExist:
+            raise PaymentException(_('You entered an order that could not be found.'))
         p = order.payments.create(
             state=OrderPayment.PAYMENT_STATE_PENDING,
             amount=refund.amount,
diff --git a/src/pretix/control/views/orders.py b/src/pretix/control/views/orders.py
index a2daa5ed8..492b18447 100644
--- a/src/pretix/control/views/orders.py
+++ b/src/pretix/control/views/orders.py
@@ -497,7 +497,8 @@ class OrderRefundView(OrderView):
                     if offsetting_value:
                         refund_selected += offsetting_value
                         try:
-                            order = Order.objects.get(code=self.request.POST.get('order-offsetting'))
+                            order = Order.objects.get(code=self.request.POST.get('order-offsetting'),
+                                                      event__organizer=self.request.organizer)
                         except Order.DoesNotExist:
                             messages.error(self.request, _('You entered an order that could not be found.'))
                             is_valid = False