diff --git a/cof/migrations/0001_initial.py b/cof/migrations/0001_initial.py
index fdfeaed4..1ba71322 100644
--- a/cof/migrations/0001_initial.py
+++ b/cof/migrations/0001_initial.py
@@ -310,7 +310,7 @@ class Migration(migrations.Migration):
             model_name='petitcoursdemande',
             name='traitee_par',
             field=models.ForeignKey(
-                on_delete=models.CASCADE,
+                on_delete=models.PROTECT,
                 blank=True,
                 to=settings.AUTH_USER_MODEL,
                 null=True),
@@ -319,7 +319,7 @@ class Migration(migrations.Migration):
             model_name='petitcoursattributioncounter',
             name='matiere',
             field=models.ForeignKey(
-                on_delete=models.CASCADE,
+                on_delete=models.PROTECT,
                 verbose_name='Matiere',
                 to='cof.PetitCoursSubject'),
         ),
@@ -327,7 +327,7 @@ class Migration(migrations.Migration):
             model_name='petitcoursattributioncounter',
             name='user',
             field=models.ForeignKey(
-                on_delete=models.CASCADE,
+                on_delete=models.PROTECT,
                 to=settings.AUTH_USER_MODEL),
         ),
         migrations.AddField(
@@ -342,7 +342,7 @@ class Migration(migrations.Migration):
             model_name='petitcoursattribution',
             name='matiere',
             field=models.ForeignKey(
-                on_delete=models.CASCADE,
+                on_delete=models.PROTECT,
                 verbose_name='Mati\xe8re',
                 to='cof.PetitCoursSubject'),
         ),