diff --git a/apps/api/src/services/ollama_failover_manager.py b/apps/api/src/services/ollama_failover_manager.py
index c9f531168..b9aa722ce 100644
--- a/apps/api/src/services/ollama_failover_manager.py
+++ b/apps/api/src/services/ollama_failover_manager.py
@@ -83,6 +83,7 @@ class OllamaRoutingResult:
     fallback_chain: list[OllamaEndpoint]
     routing_reason: str
     health_111: HealthReport
+    health_188: HealthReport | None = None  # optional backward-compat（188 不在路由鏈時為 None）
 
     def all_endpoints_in_order(self) -> list[OllamaEndpoint]:
         """返回完整的優先序端點列表（primary 在前）"""
diff --git a/apps/api/tests/test_ai_router_failover_integration.py b/apps/api/tests/test_ai_router_failover_integration.py
index 958471314..f1dfc008f 100644
--- a/apps/api/tests/test_ai_router_failover_integration.py
+++ b/apps/api/tests/test_ai_router_failover_integration.py
@@ -59,7 +59,6 @@ def _make_failover_result(
         fallback_chain=fb_endpoints,
         routing_reason=f"test: {primary_provider}",
         health_111=_make_health(HealthStatus.OFFLINE),
-        health_188=None,
     )