diff --git a/interfaces/istio_metadata/src/charmlibs/interfaces/istio_metadata/_schema.py b/interfaces/istio_metadata/src/charmlibs/interfaces/istio_metadata/_schema.py
index 8a5838f9e..795cb9405 100644
--- a/interfaces/istio_metadata/src/charmlibs/interfaces/istio_metadata/_schema.py
+++ b/interfaces/istio_metadata/src/charmlibs/interfaces/istio_metadata/_schema.py
@@ -34,3 +34,9 @@ class IstioMetadataAppData(BaseModel):
         description='The root namespace for the Istio installation.',
         examples=['istio-system'],
     )
+
+
+ProviderAppData = IstioMetadataAppData
+ProviderUnitData = None
+RequirerAppData = None
+RequirerUnitData = None