diff --git a/shc/data_logging.py b/shc/data_logging.py
index e29729cb..898368b4 100644
--- a/shc/data_logging.py
+++ b/shc/data_logging.py
@@ -455,7 +455,7 @@ async def _websocket_before_subscribe(self, ws: aiohttp.web.WebSocketResponse) -
                                      cls=SHCJsonEncoder))
 
 
-def aggregate(data: List[Tuple[datetime.datetime, T]], type_: Type[T], start_time: datetime.datetime,
+def aggregate(data: List[Tuple[datetime.datetime, T]], type_: Type[T], start_time: datetime.datetime,  # noqa: C901
               end_time: datetime.datetime, aggregation_method: AggregationMethod,
               aggregation_interval: datetime.timedelta) -> List[Tuple[datetime.datetime, float]]:
     """