diff --git a/src/pretix/base/services/cart.py b/src/pretix/base/services/cart.py
index 8ff5c0001..23021f283 100644
--- a/src/pretix/base/services/cart.py
+++ b/src/pretix/base/services/cart.py
@@ -1131,7 +1131,7 @@ def add_items_to_cart(self, event: int, items: List[dict], cart_id: str=None, lo
 
 
 @app.task(base=ProfiledEventTask, bind=True, max_retries=5, default_retry_delay=1, throws=(CartError,))
-def apply_voucher(self, event: Event, voucher: str, cart_id: str=None, locale='en') -> None:
+def apply_voucher(self, event: Event, voucher: str, cart_id: str=None, locale='en', sales_channel='web') -> None:
     """
     Removes a list of items from a user's cart.
     :param event: The event ID in question
@@ -1141,7 +1141,7 @@ def apply_voucher(self, event: Event, voucher: str, cart_id: str=None, locale='e
     with language(locale):
         try:
             try:
-                cm = CartManager(event=event, cart_id=cart_id)
+                cm = CartManager(event=event, cart_id=cart_id, sales_channel=sales_channel)
                 cm.apply_voucher(voucher)
                 cm.commit()
             except LockTimeoutException:
@@ -1151,7 +1151,7 @@ def apply_voucher(self, event: Event, voucher: str, cart_id: str=None, locale='e
 
 
 @app.task(base=ProfiledEventTask, bind=True, max_retries=5, default_retry_delay=1, throws=(CartError,))
-def remove_cart_position(self, event: Event, position: int, cart_id: str=None, locale='en') -> None:
+def remove_cart_position(self, event: Event, position: int, cart_id: str=None, locale='en', sales_channel='web') -> None:
     """
     Removes a list of items from a user's cart.
     :param event: The event ID in question
@@ -1161,7 +1161,7 @@ def remove_cart_position(self, event: Event, position: int, cart_id: str=None, l
     with language(locale):
         try:
             try:
-                cm = CartManager(event=event, cart_id=cart_id)
+                cm = CartManager(event=event, cart_id=cart_id, sales_channel=sales_channel)
                 cm.remove_item(position)
                 cm.commit()
             except LockTimeoutException:
@@ -1171,7 +1171,7 @@ def remove_cart_position(self, event: Event, position: int, cart_id: str=None, l
 
 
 @app.task(base=ProfiledEventTask, bind=True, max_retries=5, default_retry_delay=1, throws=(CartError,))
-def clear_cart(self, event: Event, cart_id: str=None, locale='en') -> None:
+def clear_cart(self, event: Event, cart_id: str=None, locale='en', sales_channel='web') -> None:
     """
     Removes a list of items from a user's cart.
     :param event: The event ID in question
@@ -1180,7 +1180,7 @@ def clear_cart(self, event: Event, cart_id: str=None, locale='en') -> None:
     with language(locale):
         try:
             try:
-                cm = CartManager(event=event, cart_id=cart_id)
+                cm = CartManager(event=event, cart_id=cart_id, sales_channel=sales_channel)
                 cm.clear()
                 cm.commit()
             except LockTimeoutException:
diff --git a/src/pretix/presale/views/cart.py b/src/pretix/presale/views/cart.py
index 1efc6f092..2d6932d56 100644
--- a/src/pretix/presale/views/cart.py
+++ b/src/pretix/presale/views/cart.py
@@ -338,7 +338,8 @@ class CartApplyVoucher(EventViewMixin, CartActionMixin, AsyncAction, View):
 
     def post(self, request, *args, **kwargs):
         if 'voucher' in request.POST:
-            return self.do(self.request.event.id, request.POST.get('voucher'), get_or_create_cart_id(self.request), translation.get_language())
+            return self.do(self.request.event.id, request.POST.get('voucher'), get_or_create_cart_id(self.request),
+                           translation.get_language(), request.sales_channel.identifier)
         else:
             if 'ajax' in self.request.GET or 'ajax' in self.request.POST:
                 return JsonResponse({
@@ -362,7 +363,8 @@ class CartRemove(EventViewMixin, CartActionMixin, AsyncAction, View):
 
     def post(self, request, *args, **kwargs):
         if 'id' in request.POST:
-            return self.do(self.request.event.id, request.POST.get('id'), get_or_create_cart_id(self.request), translation.get_language())
+            return self.do(self.request.event.id, request.POST.get('id'), get_or_create_cart_id(self.request),
+                           translation.get_language(), request.sales_channel.identifier)
         else:
             if 'ajax' in self.request.GET or 'ajax' in self.request.POST:
                 return JsonResponse({
@@ -382,7 +384,8 @@ class CartClear(EventViewMixin, CartActionMixin, AsyncAction, View):
         return _('Your cart is now empty.')
 
     def post(self, request, *args, **kwargs):
-        return self.do(self.request.event.id, get_or_create_cart_id(self.request), translation.get_language())
+        return self.do(self.request.event.id, get_or_create_cart_id(self.request), translation.get_language(),
+                       request.sales_channel.identifier)
 
 
 @method_decorator(allow_cors_if_namespaced, 'dispatch')