diff --git a/astrbot/_internal/runtime/orchestrator.py b/astrbot/_internal/runtime/orchestrator.py
index 268807a05..8211fe0c4 100644
--- a/astrbot/_internal/runtime/orchestrator.py
+++ b/astrbot/_internal/runtime/orchestrator.py
@@ -143,6 +143,7 @@ class AstrbotOrchestrator(BaseAstrbotOrchestrator):
         """Record a message activity for stats tracking."""
         self._message_count += 1
         import time
+
         self._last_activity_timestamp = time.time()
 
     async def shutdown(self) -> None:
diff --git a/astrbot/_internal/stars/runtime_status_star.py b/astrbot/_internal/stars/runtime_status_star.py
index f4af62fa4..eaa396ed4 100644
--- a/astrbot/_internal/stars/runtime_status_star.py
+++ b/astrbot/_internal/stars/runtime_status_star.py
@@ -119,7 +119,9 @@ class RuntimeStatusStar:
             result["total_messages"] = getattr(self._orchestrator, "_message_count", 0)
             last_ts = getattr(self._orchestrator, "_last_activity_timestamp", None)
             if last_ts is not None:
-                result["last_activity"] = datetime.fromtimestamp(last_ts, tz=timezone.utc).isoformat()
+                result["last_activity"] = datetime.fromtimestamp(
+                    last_ts, tz=timezone.utc
+                ).isoformat()
             else:
                 result["last_activity"] = None
         return result