diff --git a/llama_stack/core/routers/inference.py b/llama_stack/core/routers/inference.py
index 4b66601bb..8dcad85e3 100644
--- a/llama_stack/core/routers/inference.py
+++ b/llama_stack/core/routers/inference.py
@@ -755,7 +755,7 @@ class InferenceRouter(Inference):
                             choices_data[idx] = {
                                 "content_parts": [],
                                 "tool_calls_builder": {},
-                                "finish_reason": None,
+                                "finish_reason": "stop",
                                 "logprobs_content_parts": [],
                             }
                         current_choice_data = choices_data[idx]