diff --git a/catalystwan/models/configuration/feature_profile/sdwan/service/lan/ethernet.py b/catalystwan/models/configuration/feature_profile/sdwan/service/lan/ethernet.py
index 53d66bb3..9fd42519 100644
--- a/catalystwan/models/configuration/feature_profile/sdwan/service/lan/ethernet.py
+++ b/catalystwan/models/configuration/feature_profile/sdwan/service/lan/ethernet.py
@@ -216,7 +216,9 @@ class VrrpIPv4(BaseModel):
         serialization_alias="ipAddress", validation_alias="ipAddress"
     )
     ip_address_secondary: Optional[List[StaticIPv4Address]] = Field(
-        serialization_alias="ipAddressSecondary", validation_alias="ipAddressSecondary"
+        serialization_alias="ipAddressSecondary",
+        validation_alias="ipAddressSecondary",
+        default=None,
     )
     tloc_pref_change: Union[Global[bool], Default[bool]] = Field(
         serialization_alias="tlocPrefChange", validation_alias="tlocPrefChange", default=Default[bool](value=False)
diff --git a/catalystwan/models/configuration/feature_profile/sdwan/service/lan/svi.py b/catalystwan/models/configuration/feature_profile/sdwan/service/lan/svi.py
index 408ed399..75c33fe0 100644
--- a/catalystwan/models/configuration/feature_profile/sdwan/service/lan/svi.py
+++ b/catalystwan/models/configuration/feature_profile/sdwan/service/lan/svi.py
@@ -41,7 +41,7 @@ class VrrpIPv4(BaseModel):
         serialization_alias="ipAddress", validation_alias="ipAddress"
     )
     ip_address_secondary: Optional[List[VrrpIPv4SecondaryAddress]] = Field(
-        serialization_alias="ipAddressSecondary", validation_alias="ipAddressSecondary"
+        serialization_alias="ipAddressSecondary", validation_alias="ipAddressSecondary", default=None
     )
     tloc_pref_change: Union[Global[bool], Default[bool]] = Field(
         serialization_alias="tlocPrefChange", validation_alias="tlocPrefChange", default=Default[bool](value=False)