diff --git a/hc/accounts/migrations/0021_auto_20190112_2005.py b/hc/accounts/migrations/0021_auto_20190112_2005.py
new file mode 100644
index 00000000..bda9ed3c
--- /dev/null
+++ b/hc/accounts/migrations/0021_auto_20190112_2005.py
@@ -0,0 +1,18 @@
+# Generated by Django 2.1.5 on 2019-01-12 20:05
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('accounts', '0020_auto_20190112_1950'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='project',
+            name='badge_key',
+            field=models.CharField(max_length=150, unique=True),
+        ),
+    ]
diff --git a/hc/accounts/models.py b/hc/accounts/models.py
index 52c34323..000052db 100644
--- a/hc/accounts/models.py
+++ b/hc/accounts/models.py
@@ -240,7 +240,7 @@ class Project(models.Model):
     owner = models.ForeignKey(User, models.CASCADE)
     api_key = models.CharField(max_length=128, blank=True)
     api_key_readonly = models.CharField(max_length=128, blank=True)
-    badge_key = models.CharField(max_length=150, blank=True, null=True)
+    badge_key = models.CharField(max_length=150, unique=True)
 
 
 class Member(models.Model):
diff --git a/hc/test.py b/hc/test.py
index 29bfe226..eb8db788 100644
--- a/hc/test.py
+++ b/hc/test.py
@@ -15,6 +15,7 @@ class BaseTestCase(TestCase):
         self.alice.save()
 
         self.project = Project(owner=self.alice, api_key="X" * 32)
+        self.project.badge_key = self.alice.username
         self.project.save()
 
         self.profile = Profile(user=self.alice, api_key="X" * 32)
@@ -28,6 +29,7 @@ class BaseTestCase(TestCase):
         self.bob.save()
 
         self.bobs_project = Project(owner=self.bob)
+        self.bobs_project.badge_key = self.bob.username
         self.bobs_project.save()
 
         self.bobs_profile = Profile(user=self.bob)