diff --git a/passerelle/apps/sivin/models.py b/passerelle/apps/sivin/models.py
index 54d8fd36..be0544f6 100644
--- a/passerelle/apps/sivin/models.py
+++ b/passerelle/apps/sivin/models.py
@@ -84,6 +84,8 @@ class Resource(BaseResource):
         return resp.json()
 
     def get_infos_by_immat(self, endpoint, immat, codesra=None):
+        # remove dashes / spaces in immat to avoid lookup issues
+        immat = immat.strip().replace('-', '').replace(' ', '').upper()
         payload = {'immat': immat}
         if codesra is not None:
             payload['codesra'] = codesra
diff --git a/tests/test_sivin.py b/tests/test_sivin.py
index fb0810bf..fecbbb4a 100644
--- a/tests/test_sivin.py
+++ b/tests/test_sivin.py
@@ -146,6 +146,7 @@ def test_get_details_by_vin(mocked_post, app, conn):
         kwargs={'connector': 'sivin', 'endpoint': 'consultervehiculeparvin', 'slug': conn.slug},
     )
     resp = app.get(url, params={'apikey': 'sivinkey', 'vin': 'VF1BA0E0514143067'}).json
+
     assert mocked_post.call_count == 2
     assert not resp['err']
     assert resp['data'] == VEHICLE_DETAILS
@@ -183,8 +184,9 @@ def test_get_vehicle_theorical_finition(mocked_post, app, conn):
         'generic-endpoint',
         kwargs={'connector': 'sivin', 'endpoint': 'consulterfinitiontheoriqueparimmat', 'slug': conn.slug},
     )
-    resp = app.get(url, params={'apikey': 'sivinkey', 'immat': '01XT0747'}).json
+    resp = app.get(url, params={'apikey': 'sivinkey', 'immat': '01-xT0 747'}).json
     assert mocked_post.call_count == 2
+    assert mocked_post.mock_calls[-1].kwargs['json'] == {'immat': '01XT0747'}
     assert not resp['err']
     assert resp['data'] == VEHICLE_THEORICAL_FINITION