diff --git a/gso/cli/imports.py b/gso/cli/imports.py
index cb0158842fe169273b0b4e77a2478dbd117b0a1a..6a82ddecc513fc71496de598d83d2499272bab5a 100644
--- a/gso/cli/imports.py
+++ b/gso/cli/imports.py
@@ -318,7 +318,7 @@ class L3CoreServiceImportModel(BaseModel):
 class IASImportModel(L3CoreServiceImportModel):
     """Import IAS model."""
 
-    ias_flavor: IASFlavor | None = IASFlavor.IAS_PS_OPT_OUT
+    ias_flavor: IASFlavor = IASFlavor.IAS_PS_OPT_OUT
 
 
 class LanSwitchInterconnectRouterSideImportModel(BaseModel):
diff --git a/test/fixtures/l3_core_service_fixtures.py b/test/fixtures/l3_core_service_fixtures.py
index f41248bfabc055d96bc77cd8afc78dae0e8931c8..04e9c175f48585a42f4c48e4687f00757ad7b0e0 100644
--- a/test/fixtures/l3_core_service_fixtures.py
+++ b/test/fixtures/l3_core_service_fixtures.py
@@ -222,7 +222,7 @@ def ias_subscription_factory(faker, partner_factory, access_port_factory, save_l
         ap_list: list[AccessPort] | None = None,
         start_date="2023-05-24T00:00:00+00:00",
         status: SubscriptionLifecycle | None = None,
-        ias_flavor: str | None = IASFlavor.IAS_PS_OPT_OUT,
+        ias_flavor: IASFlavor | None = IASFlavor.IAS_PS_OPT_OUT,
         *,
         is_imported: bool | None = False,
     ) -> SubscriptionModel: