diff --git a/lib/Alchemy/Phrasea/Controller/Admin/FieldsController.php b/lib/Alchemy/Phrasea/Controller/Admin/FieldsController.php
index 85b1fe1731..c13efa100d 100644
--- a/lib/Alchemy/Phrasea/Controller/Admin/FieldsController.php
+++ b/lib/Alchemy/Phrasea/Controller/Admin/FieldsController.php
@@ -129,7 +129,7 @@ class FieldsController extends Controller
     {
         $vocabularies = $this->getVocabularies();
 
-        $vocabulary = $vocabularies[$type];
+        $vocabulary = $vocabularies[strtolower($type)];
 
         Assertion::isInstanceOf($vocabulary, ControlProviderInterface::class);
 
diff --git a/lib/Alchemy/Phrasea/ControllerProvider/Admin/Fields.php b/lib/Alchemy/Phrasea/ControllerProvider/Admin/Fields.php
index 4d921391ba..b6f111a37a 100644
--- a/lib/Alchemy/Phrasea/ControllerProvider/Admin/Fields.php
+++ b/lib/Alchemy/Phrasea/ControllerProvider/Admin/Fields.php
@@ -28,7 +28,7 @@ class Fields implements ControllerProviderInterface, ServiceProviderInterface
         $app['vocabularies'] = $app->share(function (PhraseaApplication $app) {
             $vocabularies = new \Pimple();
 
-            $vocabularies['User'] = $vocabularies->share(function () use ($app) {
+            $vocabularies['user'] = $vocabularies->share(function () use ($app) {
                 return new UserProvider($app);
             });
 
diff --git a/tests/Alchemy/Tests/Phrasea/Controller/Admin/FieldsTest.php b/tests/Alchemy/Tests/Phrasea/Controller/Admin/FieldsTest.php
index 423b10966f..8e10b1842c 100644
--- a/tests/Alchemy/Tests/Phrasea/Controller/Admin/FieldsTest.php
+++ b/tests/Alchemy/Tests/Phrasea/Controller/Admin/FieldsTest.php
@@ -181,7 +181,7 @@ class FieldsTest extends \PhraseanetAuthenticatedWebTestCase
         $body[count($body) - 1]['readonly'] = true;
         $body[count($body) - 1]['required'] = false;
 
-        $response = $this->request("PUT", sprintf("/admin/fields/%d/fields", $databox->get_sbas_id()), [], [], [], json_encode($body));
+        $response = $this->request("PUT", sprintf("/admin/fields/%d/fields", $databox->get_sbas_id()), [], [], json_encode($body));
 
         $this->assertEquals("application/json", $response->headers->get("content-type"));
 
@@ -230,7 +230,7 @@ class FieldsTest extends \PhraseanetAuthenticatedWebTestCase
             'vocabulary-restricted' => true,
         ]);
 
-        $response = $this->request("POST", sprintf("/admin/fields/%d/fields", $databox->get_sbas_id()), [], [], [], $body);
+        $response = $this->request("POST", sprintf("/admin/fields/%d/fields", $databox->get_sbas_id()), [], [], $body);
 
         $this->assertEquals("application/json", $response->headers->get("content-type"));