diff --git a/vllm/model_executor/layers/quantization/compressed_tensors/compressed_tensors.py b/vllm/model_executor/layers/quantization/compressed_tensors/compressed_tensors.py
index b07bf675ca47..97041a5a050f 100644
--- a/vllm/model_executor/layers/quantization/compressed_tensors/compressed_tensors.py
+++ b/vllm/model_executor/layers/quantization/compressed_tensors/compressed_tensors.py
@@ -63,7 +63,7 @@ def __init__(
         sparsity_ignore_list: list[str],
         kv_cache_scheme: Optional[dict[str, Any]] = None,
         config: Optional[dict[str, Any]] = None,
-        transform_config: Optional[TransformConfig] = None,
+        transform_config: Optional[dict[str, Any]] = None,
     ):
         super().__init__()
         self.ignore = ignore
@@ -75,7 +75,7 @@ def __init__(
         self.sparsity_ignore_list = sparsity_ignore_list
         self.config = config
 
-        if transform_config is not None:
+        if transform_config:
             self.transform_config = TransformConfig.model_validate(
                 transform_config)
         else: