diff --git a/hc/api/migrations/0047_auto_20181225_2315.py b/hc/api/migrations/0047_auto_20181225_2315.py
new file mode 100644
index 00000000..24dd6c0c
--- /dev/null
+++ b/hc/api/migrations/0047_auto_20181225_2315.py
@@ -0,0 +1,19 @@
+# Generated by Django 2.1.4 on 2018-12-25 23:15
+
+from django.db import migrations, models
+import uuid
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('api', '0046_auto_20181218_1245'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='channel',
+            name='code',
+            field=models.UUIDField(default=uuid.uuid4, editable=False, unique=True),
+        ),
+    ]
diff --git a/hc/api/models.py b/hc/api/models.py
index 75d91710..02f2c429 100644
--- a/hc/api/models.py
+++ b/hc/api/models.py
@@ -273,7 +273,7 @@ class Ping(models.Model):
 
 class Channel(models.Model):
     name = models.CharField(max_length=100, blank=True)
-    code = models.UUIDField(default=uuid.uuid4, editable=False)
+    code = models.UUIDField(default=uuid.uuid4, editable=False, unique=True)
     user = models.ForeignKey(User, models.CASCADE)
     created = models.DateTimeField(auto_now_add=True)
     kind = models.CharField(max_length=20, choices=CHANNEL_KINDS)