diff --git a/tensorrt_llm/bench/benchmark/utils/general.py b/tensorrt_llm/bench/benchmark/utils/general.py
index 3a35008daba..0b812100ed5 100755
--- a/tensorrt_llm/bench/benchmark/utils/general.py
+++ b/tensorrt_llm/bench/benchmark/utils/general.py
@@ -111,7 +111,10 @@ def get_settings(params: dict, dataset_metadata: DatasetMetadata, model: str,
     else:
         model_config = get_model_config(model, model_path)
 
-        if isinstance(model_config, NemotronHybridConfig):
+        if isinstance(
+                model_config,
+                NemotronHybridConfig) and mamba_ssm_cache_dtype not in (None,
+                                                                        "auto"):
             model_config.set_mamba_ssm_cache_dtype(mamba_ssm_cache_dtype)
 
         from tensorrt_llm._torch.model_config import ModelConfig