diff --git a/passerelle_imio_liege_rn/migrations/0004_auto_20190625_1114.py b/passerelle_imio_liege_rn/migrations/0004_auto_20190625_1114.py
new file mode 100644
index 0000000..cb3e893
--- /dev/null
+++ b/passerelle_imio_liege_rn/migrations/0004_auto_20190625_1114.py
@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.12 on 2019-06-25 09:14
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('passerelle_imio_liege_rn', '0003_remove_imioliegern_log_level'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='imioliegern',
+            name='service_url',
+            field=models.CharField(help_text='Gateway Web Service URL', max_length=256, verbose_name='Service URL'),
+        ),
+    ]
diff --git a/passerelle_imio_liege_rn/models.py b/passerelle_imio_liege_rn/models.py
index 9585e14..ce412b6 100644
--- a/passerelle_imio_liege_rn/models.py
+++ b/passerelle_imio_liege_rn/models.py
@@ -22,7 +22,7 @@ from passerelle.utils.api import endpoint
 
 
 class ImioLiegeRn(BaseResource):
-    service_url = models.CharField(max_length=128, blank=False,
+    service_url = models.CharField(max_length=256, blank=False,
             verbose_name=_('Service URL'),
             help_text=_('Gateway Web Service URL'))
     verify_cert = models.BooleanField(default=True,