diff --git a/fast_llm/models/ssm/config.py b/fast_llm/models/ssm/config.py
index 75bb2a3be..e27e52802 100644
--- a/fast_llm/models/ssm/config.py
+++ b/fast_llm/models/ssm/config.py
@@ -179,7 +179,6 @@ class HybridSSMModelConfig(FastLLMModelConfig):
         AprielSSMHHybridHuggingfaceCheckpointFormat,
         AprielThinkerSSMHHybridHuggingfaceCheckpointFormat,
     )
-    checkpoint_formats = FastLLMModelConfig.checkpoint_formats + (LLambaHuggingfaceCheckpointFormat,)
 
     @classmethod
     def get_model_class(cls) -> type["HybridSSMModel"]: