diff --git a/supertokens_python/recipe/multitenancy/interfaces.py b/supertokens_python/recipe/multitenancy/interfaces.py
index 2633e39f5..9adec08b6 100644
--- a/supertokens_python/recipe/multitenancy/interfaces.py
+++ b/supertokens_python/recipe/multitenancy/interfaces.py
@@ -294,6 +294,6 @@ async def login_methods_get(
 
 
 TypeGetAllowedDomainsForTenantId = Callable[
-    [Union[str, None], Dict[str, Any]],
+    [str, Dict[str, Any]],
     Awaitable[List[str]],
 ]