diff --git a/src/pretix/base/models/items.py b/src/pretix/base/models/items.py
index acd2bd775..d69db384b 100644
--- a/src/pretix/base/models/items.py
+++ b/src/pretix/base/models/items.py
@@ -793,7 +793,7 @@ class Item(LoggedModel):
     class Meta:
         verbose_name = _("Product")
         verbose_name_plural = _("Products")
-        ordering = ("category__position", "category", "position")
+        ordering = ("category__position", "category", "position", "pk")
 
     def __str__(self):
         return str(self.internal_name or self.name)