diff --git a/docs/release-notes/version-2.7.md b/docs/release-notes/version-2.7.md
index 3a4e466e3..14fe69622 100644
--- a/docs/release-notes/version-2.7.md
+++ b/docs/release-notes/version-2.7.md
@@ -17,6 +17,7 @@
 * [#4194](https://github.com/netbox-community/netbox/issues/4194) - Role field should not be required when searching/filtering secrets
 * [#4196](https://github.com/netbox-community/netbox/issues/4196) - Fix exception when viewing LLDP neighbors page
 * [#4202](https://github.com/netbox-community/netbox/issues/4202) - Prevent reassignment to master device when bulk editing VC member interfaces
+* [#4204](https://github.com/netbox-community/netbox/issues/4204) - Fix assignment of mask length when bulk editing prefixes
 
 ---
 
diff --git a/netbox/utilities/views.py b/netbox/utilities/views.py
index d0257324e..19a6d655e 100644
--- a/netbox/utilities/views.py
+++ b/netbox/utilities/views.py
@@ -656,9 +656,8 @@ class BulkEditView(GetReturnURLMixin, View):
                                 try:
                                     model_field = model._meta.get_field(name)
                                 except FieldDoesNotExist:
-                                    # The form field is used to modify a field rather than set its value directly,
-                                    # so we skip it.
-                                    continue
+                                    # This form field is used to modify a field rather than set its value directly
+                                    model_field = None
 
                                 # Handle nullification
                                 if name in form.nullable_fields and name in nullified_fields: