diff --git a/scipost_django/submissions/migrations/0110_alter_refereeinvitation_accepted.py b/scipost_django/submissions/migrations/0110_alter_refereeinvitation_accepted.py
new file mode 100644
index 0000000000000000000000000000000000000000..1e9ec6064133c88312ed4b847a8b31d869c88dd5
--- /dev/null
+++ b/scipost_django/submissions/migrations/0110_alter_refereeinvitation_accepted.py
@@ -0,0 +1,18 @@
+# Generated by Django 3.2.5 on 2021-10-08 05:49
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('submissions', '0109_alter_submission_proceedings'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='refereeinvitation',
+            name='accepted',
+            field=models.BooleanField(blank=True, choices=[(None, 'Response pending'), (True, 'Accept'), (False, 'Decline')], default=None, null=True),
+        ),
+    ]
diff --git a/scipost_django/submissions/models/referee_invitation.py b/scipost_django/submissions/models/referee_invitation.py
index 1e180dd26a22625255cd3fb877c4afbfe53ba56b..0578c91e2bcab20100b0388b6877df39b1c48357 100644
--- a/scipost_django/submissions/models/referee_invitation.py
+++ b/scipost_django/submissions/models/referee_invitation.py
@@ -56,7 +56,7 @@ class RefereeInvitation(SubmissionRelatedObjectMixin, models.Model):
     nr_reminders = models.PositiveSmallIntegerField(default=0)
     date_last_reminded = models.DateTimeField(blank=True, null=True)
     accepted = models.BooleanField(
-        null=True,
+        blank=True, null=True,
         choices=ASSIGNMENT_NULLBOOL,
         default=None
     )