diff --git a/opentech/apply/funds/migrations/0032_make_reviewers_optional_in_all_instances.py b/opentech/apply/funds/migrations/0032_make_reviewers_optional_in_all_instances.py
new file mode 100644
index 0000000000000000000000000000000000000000..5e7088357954b8ebdc589bd6f12ec01616740444
--- /dev/null
+++ b/opentech/apply/funds/migrations/0032_make_reviewers_optional_in_all_instances.py
@@ -0,0 +1,35 @@
+# Generated by Django 2.0.2 on 2018-03-19 12:09
+
+from django.conf import settings
+from django.db import migrations, models
+import modelcluster.fields
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('funds', '0031_labtype_reviewers'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='applicationsubmission',
+            name='reviewers',
+            field=models.ManyToManyField(blank=True, limit_choices_to={'groups__name__in': ['Staff', 'Reviewer']}, related_name='submissions_reviewer', to=settings.AUTH_USER_MODEL),
+        ),
+        migrations.AlterField(
+            model_name='fundtype',
+            name='reviewers',
+            field=modelcluster.fields.ParentalManyToManyField(blank=True, limit_choices_to={'groups__name': 'Reviewer'}, related_name='fund_reviewers', to=settings.AUTH_USER_MODEL),
+        ),
+        migrations.AlterField(
+            model_name='labtype',
+            name='reviewers',
+            field=modelcluster.fields.ParentalManyToManyField(blank=True, limit_choices_to={'groups__name': 'Reviewer'}, related_name='labs_reviewer', to=settings.AUTH_USER_MODEL),
+        ),
+        migrations.AlterField(
+            model_name='round',
+            name='reviewers',
+            field=modelcluster.fields.ParentalManyToManyField(blank=True, limit_choices_to={'groups__name': 'Reviewer'}, related_name='rounds_reviewer', to=settings.AUTH_USER_MODEL),
+        ),
+    ]
diff --git a/opentech/apply/funds/models.py b/opentech/apply/funds/models.py
index a3f375eaee10a48787b3c6bbf52d85da0329bcab..463fe834ec154ac4ed10bb7a646a84c642e0f851 100644
--- a/opentech/apply/funds/models.py
+++ b/opentech/apply/funds/models.py
@@ -184,6 +184,8 @@ class FundType(EmailForm, WorkflowStreamForm):  # type: ignore
         settings.AUTH_USER_MODEL,
         related_name='fund_reviewers',
         limit_choices_to=LIMIT_TO_REVIEWERS,
+        blank=True,
+
     )
 
     parent_page_types = ['apply_home.ApplyHomePage']
@@ -286,6 +288,7 @@ class Round(WorkflowStreamForm, SubmittableStreamForm):  # type: ignore
         settings.AUTH_USER_MODEL,
         related_name='rounds_reviewer',
         limit_choices_to=LIMIT_TO_REVIEWERS,
+        blank=True,
     )
     start_date = models.DateField(default=date.today)
     end_date = models.DateField(
@@ -420,6 +423,7 @@ class LabType(EmailForm, WorkflowStreamForm, SubmittableStreamForm):  # type: ig
         settings.AUTH_USER_MODEL,
         related_name='labs_reviewer',
         limit_choices_to=LIMIT_TO_REVIEWERS,
+        blank=True,
     )
 
     parent_page_types = ['apply_home.ApplyHomePage']
@@ -518,6 +522,7 @@ class ApplicationSubmission(WorkflowHelpers, BaseStreamForm, AbstractFormSubmiss
         settings.AUTH_USER_MODEL,
         related_name='submissions_reviewer',
         limit_choices_to=LIMIT_TO_STAFF_AND_REVIEWERS,
+        blank=True,
     )
     user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.SET_NULL, null=True)
     search_data = models.TextField()