diff --git a/gso/products/product_blocks/ias.py b/gso/products/product_blocks/ias.py
index 615fc58dd23d327d877149a6e752d6ac43de7a20..fdf26d324f46296a68aef88b21c4417071826d7f 100644
--- a/gso/products/product_blocks/ias.py
+++ b/gso/products/product_blocks/ias.py
@@ -23,7 +23,7 @@ class IASBlockInactive(ProductBlockModel, lifecycle=[SubscriptionLifecycle.INITI
     """An inactive IAS product block. See `IASBlock`."""
 
     l3_core: L3CoreServiceBlockInactive | None = None
-    ias_flavor: IASFlavor | None = IASFlavor.IAS_PS_OPT_OUT
+    ias_flavor: IASFlavor = IASFlavor.IAS_PS_OPT_OUT
 
 
 class IASBlockProvisioning(IASBlockInactive, lifecycle=[SubscriptionLifecycle.PROVISIONING]):