diff --git a/boards/migrations/0070_auto_20171225_1149.py b/boards/migrations/0070_auto_20171225_1149.py
new file mode 100644
--- /dev/null
+++ b/boards/migrations/0070_auto_20171225_1149.py
@@ -0,0 +1,23 @@
+# Generated by Django 2.0 on 2017-12-25 09:49
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('boards', '0069_usersettings'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='post',
+            name='attachments',
+            field=models.ManyToManyField(blank=True, related_name='attachment_posts', to='boards.Attachment'),
+        ),
+        migrations.AlterField(
+            model_name='post',
+            name='referenced_posts',
+            field=models.ManyToManyField(blank=True, db_index=True, related_name='refposts', to='boards.Post'),
+        ),
+    ]
diff --git a/boards/models/post/__init__.py b/boards/models/post/__init__.py
--- a/boards/models/post/__init__.py
+++ b/boards/models/post/__init__.py
@@ -77,7 +77,7 @@ class Post(models.Model, Viewable):
     text = TextField(blank=True, default='')
     _text_rendered = TextField(blank=True, null=True, editable=False)
 
-    attachments = models.ManyToManyField(Attachment, null=True, blank=True,
+    attachments = models.ManyToManyField(Attachment, blank=True,
                                          related_name='attachment_posts')
 
     poster_ip = models.GenericIPAddressField()
@@ -86,7 +86,6 @@ class Post(models.Model, Viewable):
     last_edit_time = models.DateTimeField()
 
     referenced_posts = models.ManyToManyField('Post', symmetrical=False,
-                                              null=True,
                                               blank=True, related_name='refposts',
                                               db_index=True)
     refmap = models.TextField(null=True, blank=True)