diff --git a/cotisations/migrations/0010_auto_20160702_1840.py b/cotisations/migrations/0010_auto_20160702_1840.py
index 426f94d6..76780e28 100644
--- a/cotisations/migrations/0010_auto_20160702_1840.py
+++ b/cotisations/migrations/0010_auto_20160702_1840.py
@@ -33,7 +33,11 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
-        migrations.AlterField(
+        migrations.RemoveField(
+            model_name='article',
+            name='duration',
+            ),
+        migrations.AddField(
             model_name='article',
             name='duration',
             field=models.IntegerField(null=True, help_text='Durée exprimée en mois entiers', blank=True),