diff --git a/netbox/virtualization/forms/bulk_create.py b/netbox/virtualization/forms/bulk_create.py
index 775e7b88d..56f1c9f94 100644
--- a/netbox/virtualization/forms/bulk_create.py
+++ b/netbox/virtualization/forms/bulk_create.py
@@ -37,9 +37,4 @@ class VirtualDiskBulkCreateForm(
     form_from_model(VirtualDisk, ['size', 'tags']),
     VirtualMachineBulkAddComponentForm
 ):
-    size = forms.IntegerField(
-        required=False,
-        label=_('Size (GB)')
-    )
-
-    replication_fields = ('name', 'size')
+    replication_fields = ('name',)
diff --git a/netbox/virtualization/models/virtualmachines.py b/netbox/virtualization/models/virtualmachines.py
index 882f861f3..db9128817 100644
--- a/netbox/virtualization/models/virtualmachines.py
+++ b/netbox/virtualization/models/virtualmachines.py
@@ -414,3 +414,7 @@ class VirtualDisk(NetBoxModel, TrackingModelMixin):
         objectchange = super().to_objectchange(action)
         objectchange.related_object = self.virtual_machine
         return objectchange
+
+    @property
+    def parent_object(self):
+        return self.virtual_machine