diff --git a/backend/apps/agents/manager/run/lane_preflight.py b/backend/apps/agents/manager/run/lane_preflight.py
index e54c6761..98ed66b1 100644
--- a/backend/apps/agents/manager/run/lane_preflight.py
+++ b/backend/apps/agents/manager/run/lane_preflight.py
@@ -99,8 +99,8 @@ def injected_dead_conn(provider: str) -> Dict:
 
 async def dead_connection(provider: str) -> Optional[Dict]:
     """The provider's connection if the router considers it dead, else None. Never raises: a preflight that cannot read health must let the turn proceed, because guessing "dead" would ground a working lane."""
-    from backend.apps.agents.core.fault_injection import armed
-    if armed("dead_lane"):
+    from backend.apps.agents.core.fault_injection import armed as p_fault_armed
+    if p_fault_armed("dead_lane"):
         logger.warning("[fault] dead_lane armed: reporting %s as a dead credential", provider)
         return injected_dead_conn(provider)
     try:
diff --git a/backend/tests/test_fault_injection.py b/backend/tests/test_fault_injection.py
index ee841316..9ac60fa0 100644
--- a/backend/tests/test_fault_injection.py
+++ b/backend/tests/test_fault_injection.py
@@ -60,6 +60,7 @@ WIRED_IN = {
     "auth_401": TURN_RUNNER,
     "transport_death": TURN_RUNNER,
     "empty_finish": "backend/apps/agents/manager/streaming/handle_assistant_message.py",
+    "dead_lane": "backend/apps/agents/manager/run/lane_preflight.py",
 }