diff --git a/stages/migrations/0020_remove_old_ext_id.py b/stages/migrations/0020_remove_old_ext_id.py
new file mode 100644
index 0000000..0a67c1e
--- /dev/null
+++ b/stages/migrations/0020_remove_old_ext_id.py
@@ -0,0 +1,19 @@
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('stages', '0019_add_old_ext_id'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='corpcontact',
+            name='ext_id_old',
+        ),
+        migrations.RemoveField(
+            model_name='corporation',
+            name='ext_id_old',
+        ),
+    ]
diff --git a/stages/models.py b/stages/models.py
index ba50b42..79dd209 100644
--- a/stages/models.py
+++ b/stages/models.py
@@ -196,7 +196,6 @@ class Student(models.Model):
 
 class Corporation(models.Model):
     ext_id = models.IntegerField(null=True, blank=True, verbose_name='ID externe')
-    ext_id_old = models.IntegerField(null=True, blank=True, verbose_name='ID externe (ancien)')
     name = models.CharField(max_length=100, verbose_name='Nom', unique=True)
     short_name = models.CharField(max_length=40, blank=True, verbose_name='Nom court')
     district = models.CharField(max_length=20, blank=True, verbose_name='Canton')
@@ -224,7 +223,6 @@ class Corporation(models.Model):
 class CorpContact(models.Model):
     corporation = models.ForeignKey(Corporation, verbose_name='Institution', on_delete=models.CASCADE)
     ext_id = models.IntegerField(null=True, blank=True, verbose_name='ID externe')
-    ext_id_old = models.IntegerField(null=True, blank=True, verbose_name='ID externe (ancien)')
     is_main = models.BooleanField(default=False, verbose_name='Contact principal')
     always_cc = models.BooleanField(default=False, verbose_name='Toujours en copie')
     title = models.CharField(max_length=40, blank=True, verbose_name='Civilité')