diff --git a/mlair/data_handler/data_handler_single_station.py b/mlair/data_handler/data_handler_single_station.py
index 360ab6408345de83c21ee5d29031b3b5f131525b..9d274558e3805334cd706fe4e2c9a914ad6e5f58 100644
--- a/mlair/data_handler/data_handler_single_station.py
+++ b/mlair/data_handler/data_handler_single_station.py
@@ -53,7 +53,7 @@ class DataHandlerSingleStation(AbstractDataHandler):
 
     _hash = ["station", "statistics_per_var", "data_origin", "station_type", "network", "sampling", "target_dim",
              "target_var", "time_dim", "iter_dim", "window_dim", "window_history_size", "window_history_offset",
-             "window_lead_time", "interpolation_limit", "interpolation_method"]
+             "window_lead_time", "interpolation_limit", "interpolation_method", "variables"]
 
     def __init__(self, station, data_path, statistics_per_var=None, station_type=DEFAULT_STATION_TYPE,
                  network=DEFAULT_NETWORK, sampling: Union[str, Tuple[str]] = DEFAULT_SAMPLING,