diff --git a/utils/forms.py b/utils/forms.py
index e38a6286..367a6921 100644
--- a/utils/forms.py
+++ b/utils/forms.py
@@ -26,8 +26,6 @@ class KeepUnselectableModelFormMixin:
         if self.instance.pk:
             previous = getattr(self.instance, field_name).all()
             selectable = self.fields[field_name].queryset
-            if callable(selectable):
-                selectable = selectable()
             return previous.exclude(pk__in=[o.pk for o in selectable])
         else:
             # Instance is being created, there is no previous item.