diff --git a/src/pretix/base/models/seating.py b/src/pretix/base/models/seating.py
index 70ac0b892e..8ddc0b605f 100644
--- a/src/pretix/base/models/seating.py
+++ b/src/pretix/base/models/seating.py
@@ -280,13 +280,13 @@ class Seat(models.Model):
 
     def is_available(self, ignore_cart=None, ignore_orderpos=None, ignore_voucher_id=None,
                      sales_channel='web',
-                     ignore_distancing=False, distance_ignore_cart_id=None):
+                     ignore_distancing=False, distance_ignore_cart_id=None, always_allow_blocked=False):
         from .orders import Order
         from .organizer import SalesChannel
 
         if isinstance(sales_channel, SalesChannel):
             sales_channel = sales_channel.identifier
-        if self.blocked and sales_channel not in self.event.settings.seating_allow_blocked_seats_for_channel:
+        if not always_allow_blocked and self.blocked and sales_channel not in self.event.settings.seating_allow_blocked_seats_for_channel:
             return False
         opqs = self.orderposition_set.filter(
             order__status__in=[Order.STATUS_PENDING, Order.STATUS_PAID],
diff --git a/src/pretix/base/services/orders.py b/src/pretix/base/services/orders.py
index b37e584736..863ca76cd2 100644
--- a/src/pretix/base/services/orders.py
+++ b/src/pretix/base/services/orders.py
@@ -1670,13 +1670,14 @@ class OrderChangeManager:
     AddBlockOperation = namedtuple('AddBlockOperation', ('position', 'block_name', 'ignore_from_quota_while_blocked'))
     RemoveBlockOperation = namedtuple('RemoveBlockOperation', ('position', 'block_name', 'ignore_from_quota_while_blocked'))
 
-    def __init__(self, order: Order, user=None, auth=None, notify=True, reissue_invoice=True):
+    def __init__(self, order: Order, user=None, auth=None, notify=True, reissue_invoice=True, allow_blocked_seats=False):
         self.order = order
         self.user = user
         self.auth = auth
         self.event = order.event
         self.split_order = None
         self.reissue_invoice = reissue_invoice
+        self.allow_blocked_seats = allow_blocked_seats
         self._committed = False
         self._totaldiff_guesstimate = 0
         self._quotadiff = Counter()
@@ -2197,7 +2198,7 @@ class OrderChangeManager:
         for seat, diff in self._seatdiff.items():
             if diff <= 0:
                 continue
-            if not seat.is_available(sales_channel=self.order.sales_channel, ignore_distancing=True) or diff > 1:
+            if not seat.is_available(sales_channel=self.order.sales_channel, ignore_distancing=True, always_allow_blocked=self.allow_blocked_seats) or diff > 1:
                 raise OrderError(self.error_messages['seat_unavailable'].format(seat=seat.name))
 
         if self.event.has_subevents:
diff --git a/src/pretix/control/views/orders.py b/src/pretix/control/views/orders.py
index 1cb9edf66f..5abcc88160 100644
--- a/src/pretix/control/views/orders.py
+++ b/src/pretix/control/views/orders.py
@@ -2146,7 +2146,8 @@ class OrderChange(OrderView):
             self.order,
             user=self.request.user,
             notify=notify,
-            reissue_invoice=self.other_form.cleaned_data['reissue_invoice'] if self.other_form.is_valid() else True
+            reissue_invoice=self.other_form.cleaned_data['reissue_invoice'] if self.other_form.is_valid() else True,
+            allow_blocked_seats=True,
         )
         form_valid = (self._process_add_fees(ocm) and
                       self._process_add_positions(ocm) and