diff --git a/api/views/diagnosticimport.py b/api/views/diagnosticimport.py
index d62906f18b..24764a185e 100644
--- a/api/views/diagnosticimport.py
+++ b/api/views/diagnosticimport.py
@@ -21,12 +21,13 @@
 
 from api.permissions import IsAuthenticated
 from api.serializers import FullCanteenSerializer
+from common.siret_sirene import normalise_siret
 from data.models import Canteen, ImportFailure, ImportType, Sector
 from data.models.diagnostic import Diagnostic
 from data.models.teledeclaration import Teledeclaration
 
 from .canteen import AddManagerView
-from .utils import camelize, decode_bytes, normalise_siret
+from .utils import camelize, decode_bytes
 
 logger = logging.getLogger(__name__)
 
diff --git a/api/views/purchaseimport.py b/api/views/purchaseimport.py
index 64756ec415..b80d3dc000 100644
--- a/api/views/purchaseimport.py
+++ b/api/views/purchaseimport.py
@@ -17,10 +17,11 @@
 
 from api.permissions import IsAuthenticated
 from api.serializers import PurchaseSerializer
+from common.siret_sirene import normalise_siret
 from data.models import Canteen, ImportFailure, ImportType, Purchase
 
 from .diagnosticimport import ImportDiagnosticsView
-from .utils import camelize, decode_bytes, normalise_siret
+from .utils import camelize, decode_bytes
 
 logger = logging.getLogger(__name__)
 
diff --git a/api/views/utils.py b/api/views/utils.py
index e72dc355c8..6b7e529226 100644
--- a/api/views/utils.py
+++ b/api/views/utils.py
@@ -13,10 +13,6 @@ def camelize(data):
     return json.loads(camel_case_bytes.decode("utf-8"))
 
 
-def normalise_siret(siret):
-    return siret.replace(" ", "").replace("\xa0", "")
-
-
 def update_change_reason_with_auth(view, object):
     try:
         update_change_reason(
diff --git a/common/utils/siret.py b/common/utils/siret.py
new file mode 100644
index 0000000000..0ef5915be8
--- /dev/null
+++ b/common/utils/siret.py
@@ -0,0 +1,2 @@
+def normalise_siret(siret):
+    return siret.replace(" ", "").replace("\xa0", "")