diff --git a/src/lightning_app/components/serve/auto_scaler.py b/src/lightning_app/components/serve/auto_scaler.py
index 7d0114069f7976..36ae720ae8943a 100644
--- a/src/lightning_app/components/serve/auto_scaler.py
+++ b/src/lightning_app/components/serve/auto_scaler.py
@@ -185,13 +185,13 @@ async def send_batch(self, batch: List[Tuple[str, _BatchRequestModel]]):
     async def consumer(self):
         while True:
             await asyncio.sleep(0.05)
-            batch = self._batch[:self.max_batch_size]
+            batch = self._batch[: self.max_batch_size]
             is_batch_ready = len(batch) == self.max_batch_size
             is_batch_timeout = time.time() - self._last_batch_sent > self.timeout_batching
             if batch and (is_batch_ready or is_batch_timeout):
                 asyncio.create_task(self.send_batch(batch))
                 # resetting the batch array, TODO - not locking the array
-                self._batch = self._batch[len(batch):]
+                self._batch = self._batch[len(batch) :]
                 self._last_batch_sent = time.time()
 
     async def process_request(self, data: BaseModel):