diff --git a/lumen/ai/llm.py b/lumen/ai/llm.py
index 3529991a..7a1994bc 100644
--- a/lumen/ai/llm.py
+++ b/lumen/ai/llm.py
@@ -92,6 +92,7 @@ def _add_system_message(
             messages = [{"role": "system", "content": system}] + messages
         return messages, input_kwargs
 
+    @classmethod
     def warmup(cls, model_kwargs: dict | None):
         """
         Allows LLM provider to perform actions that ensure that