diff --git a/config/domain/user/validation/collectivity.yaml b/config/domain/user/validation/collectivity.yaml
index c40535615c3d66e5ffc51175bcbe4cb922e7e1a1..6fff4acc108f608fed83ded3d4bc1b49b4c9ec38 100644
--- a/config/domain/user/validation/collectivity.yaml
+++ b/config/domain/user/validation/collectivity.yaml
@@ -1,4 +1,9 @@
 App\Domain\User\Model\Collectivity:
+    constraints:
+        - Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntity:
+              fields: [ 'siren' ]
+              groups: [ 'default' ]
+
     properties:
         name:
             - NotBlank: