diff --git a/passerelle/contrib/toulouse_foederis/models.py b/passerelle/contrib/toulouse_foederis/models.py
index f0bce36a..20ec114c 100644
--- a/passerelle/contrib/toulouse_foederis/models.py
+++ b/passerelle/contrib/toulouse_foederis/models.py
@@ -35,7 +35,7 @@ ATTACHMENT_SCHEMA = {
     '$schema': 'http://json-schema.org/draft-04/schema#',
     'title': _('Attachment and degree data.'),
     'description': '',
-    'required': ['application_id', 'name', 'file'],
+    'required': ['application_id', 'name'],
     'type': 'object',
     'properties': {
         'application_id': {
@@ -56,22 +56,27 @@ ATTACHMENT_SCHEMA = {
         },
         'file': {
             'description': _('File to attach.'),
-            'type': 'object',
-            'required': ['filename', 'content_type', 'content'],
-            'properties': {
-                'filename': {
-                    'description': _('File name'),
-                    'type': 'string',
+            'oneOf': [
+                {
+                    'type': 'object',
+                    'required': ['filename', 'content_type', 'content'],
+                    'properties': {
+                        'filename': {
+                            'description': _('File name'),
+                            'type': 'string',
+                        },
+                        'content_type': {
+                            'description': _('MIME type'),
+                            'type': 'string',
+                        },
+                        'content': {
+                            'description': _('Content'),
+                            'type': 'string',
+                        },
+                    },
                 },
-                'content_type': {
-                    'description': _('MIME type'),
-                    'type': 'string',
-                },
-                'content': {
-                    'description': _('Content'),
-                    'type': 'string',
-                },
-            },
+                {'type': 'null'},
+            ],
         },
     },
 }
@@ -705,7 +710,7 @@ class Resource(BaseResource, HTTPResource):
     def attach_degree(self, request, post_data):
         application_id = post_data['application_id']
         degree_label = post_data['name']
-        file = post_data['file']
+        file = post_data.get('file')
 
         degree_data = self.http_request(
             'POST',
@@ -715,17 +720,18 @@ class Resource(BaseResource, HTTPResource):
 
         degree_id = degree_data[0]['id']
 
-        self.http_request(
-            'POST',
-            f'data/diplome2/{degree_id}/fields/justificatif_diplome?viewIntegrationName=api_publik',
-            data={
-                'contentType': file['content_type'],
-                'fileName': file['filename'],
-            },
-            files={
-                'value': (None, file['content'], None),
-            },
-        )
+        if file is not None:
+            self.http_request(
+                'POST',
+                f'data/diplome2/{degree_id}/fields/justificatif_diplome?viewIntegrationName=api_publik',
+                data={
+                    'contentType': file['content_type'],
+                    'fileName': file['filename'],
+                },
+                files={
+                    'value': (None, file['content'], None),
+                },
+            )
 
         return {'err': 0}
 
diff --git a/tests/test_toulouse_foederis.py b/tests/test_toulouse_foederis.py
index 04f65b2d..5f7c7e6e 100644
--- a/tests/test_toulouse_foederis.py
+++ b/tests/test_toulouse_foederis.py
@@ -665,7 +665,19 @@ class TestEndpoints:
                 },
             )
 
-        assert response.json['err'] == 0
+            assert response.json['err'] == 0
+
+        with httmock.HTTMock(create_degree_handler, degree_file_handler, error_handler):
+            response = app.post_json(
+                '/toulouse-foederis/foederis/attach-degree',
+                params={
+                    'application_id': '424242',
+                    'name': 'DUT anarchisme',
+                    'file': None,
+                },
+            )
+
+            assert response.json['err'] == 0
 
 
 def test_migration_0003_no_null_no_charfield(migration):