diff --git a/passerelle_montpellier_sig/migrations/0001_initial.py b/passerelle_montpellier_sig/migrations/0001_initial.py
index ca334c7..80a99e5 100644
--- a/passerelle_montpellier_sig/migrations/0001_initial.py
+++ b/passerelle_montpellier_sig/migrations/0001_initial.py
@@ -16,7 +16,7 @@ class Migration(migrations.Migration):
             fields=[
                 ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
                 ('title', models.CharField(verbose_name='Title', max_length=50)),
-                ('slug', models.SlugField(verbose_name='Identifier', db_index=False)),
+                ('slug', models.SlugField(verbose_name='Identifier', unique=True)),
                 ('description', models.TextField(verbose_name='Description')),
                 ('service_url', models.CharField(help_text='SIG Web Service URL', max_length=128, verbose_name='Service URL')),
                 ('verify_cert', models.BooleanField(default=True, verbose_name='Check HTTPS Certificate validity')),