diff --git a/darts/tests/utils/historical_forecasts/test_historical_forecasts.py b/darts/tests/utils/historical_forecasts/test_historical_forecasts.py
index 9e54638192..66dc2f8542 100644
--- a/darts/tests/utils/historical_forecasts/test_historical_forecasts.py
+++ b/darts/tests/utils/historical_forecasts/test_historical_forecasts.py
@@ -2715,7 +2715,7 @@ def helper_get_model_params(
         self, model_cls, series: dict, output_chunk_length: int
     ) -> dict:
         model_params = {}
-        if model_cls in [NLinearModel]:
+        if TORCH_AVAILABLE and issubclass(model_cls, NLinearModel):
             model_params["input_chunk_length"] = 5
             model_params["output_chunk_length"] = output_chunk_length
             model_params["n_epochs"] = 1
@@ -2724,7 +2724,7 @@ def helper_get_model_params(
                 **model_params,
                 **tfm_kwargs,
             }
-        elif model_cls in [LinearRegressionModel]:
+        elif issubclass(model_cls, LinearRegressionModel):
             model_params["lags"] = 5
             model_params["output_chunk_length"] = output_chunk_length
             if "past_covariates" in series: