diff --git a/netbox/utilities/forms/fields.py b/netbox/utilities/forms/fields.py
index 055fc62ab..bc670203c 100644
--- a/netbox/utilities/forms/fields.py
+++ b/netbox/utilities/forms/fields.py
@@ -361,7 +361,7 @@ class DynamicModelChoiceField(DynamicModelChoiceMixin, forms.ModelChoiceField):
         When null option is enabled and "None" is sent as part of a form to be submitted, it is sent as the
         string 'null'.  This will check for that condition and gracefully handle the conversion to a NoneType.
         """
-        if self.null_option is not None and value == 'null':
+        if self.null_option is not None and value == settings.FILTERS_NULL_CHOICE_VALUE:
             return None
         return super().clean(value)