diff --git a/src/pretix/control/forms/item.py b/src/pretix/control/forms/item.py
index 6bd53a0c83..24b6283466 100644
--- a/src/pretix/control/forms/item.py
+++ b/src/pretix/control/forms/item.py
@@ -768,10 +768,6 @@ class ItemAddOnsFormSet(I18nFormSet):
                 if self._should_delete_form(form):
                     # This form is going to be deleted so any of its errors
                     # should not cause the entire formset to be invalid.
-                    try:
-                        categories.remove(form.cleaned_data['addon_category'].pk)
-                    except KeyError:
-                        pass
                     continue
 
             if 'addon_category' in form.cleaned_data: