diff --git a/llama_stack/providers/remote/safety/nvidia/nvidia.py b/llama_stack/providers/remote/safety/nvidia/nvidia.py
index c0f76a8df..c0df8f095 100644
--- a/llama_stack/providers/remote/safety/nvidia/nvidia.py
+++ b/llama_stack/providers/remote/safety/nvidia/nvidia.py
@@ -133,7 +133,7 @@ class NeMoGuardrails:
         """
         request_data = {
             "model": self.model,
-            "messages": messages,
+            "messages": [{"role": message.role, "content": message.content} for message in messages],
             "temperature": self.temperature,
             "top_p": 1,
             "frequency_penalty": 0,