diff --git a/src/pretix/presale/views/__init__.py b/src/pretix/presale/views/__init__.py
index b7c29bd9fa..71fd344728 100644
--- a/src/pretix/presale/views/__init__.py
+++ b/src/pretix/presale/views/__init__.py
@@ -134,8 +134,8 @@ class CartMixin:
         try:
             first_expiry = min(p.expires for p in positions) if positions else now()
             total_seconds_left = max(first_expiry - now(), timedelta()).total_seconds()
-            minutes_left = total_seconds_left // 60
-            seconds_left = total_seconds_left % 60
+            minutes_left = int(total_seconds_left // 60)
+            seconds_left = int(total_seconds_left % 60)
         except AttributeError:
             first_expiry = None
             minutes_left = None