diff --git a/src/vllm_router/dynamic_config.py b/src/vllm_router/dynamic_config.py
index bf693cc50..b243ab07b 100644
--- a/src/vllm_router/dynamic_config.py
+++ b/src/vllm_router/dynamic_config.py
@@ -139,6 +139,7 @@ def reconfigure_service_discovery(self, config: DynamicRouterConfig):
                 ServiceDiscoveryType.STATIC,
                 urls=parse_static_urls(config.static_backends),
                 models=parse_comma_separated_args(config.static_models),
+                app=self.app
             )
         elif config.service_discovery == "k8s":
             reconfigure_service_discovery(
diff --git a/src/vllm_router/service_discovery.py b/src/vllm_router/service_discovery.py
index 3c86a0ad9..edfb9bfaf 100644
--- a/src/vllm_router/service_discovery.py
+++ b/src/vllm_router/service_discovery.py
@@ -206,12 +206,12 @@ def __init__(
         app,
         urls: List[str],
         models: List[str],
-        aliases: List[str] | None,
-        model_labels: List[str] | None,
-        model_types: List[str] | None,
-        static_backend_health_checks: bool,
-        prefill_model_labels: List[str] | None,
-        decode_model_labels: List[str] | None,
+        aliases: List[str] | None=None,
+        model_labels: List[str] | None=None,
+        model_types: List[str] | None=None,
+        static_backend_health_checks: bool=False,
+        prefill_model_labels: List[str] | None=None,
+        decode_model_labels: List[str] | None=None,
     ):
         self.app = app
         assert len(urls) == len(models), "URLs and models should have the same length"