diff --git a/eval_protocol/pytest/default_single_turn_rollout_process.py b/eval_protocol/pytest/default_single_turn_rollout_process.py
index df40f01e..9e4c942a 100644
--- a/eval_protocol/pytest/default_single_turn_rollout_process.py
+++ b/eval_protocol/pytest/default_single_turn_rollout_process.py
@@ -56,6 +56,10 @@ async def process_row(row: EvaluationRow) -> EvaluationRow:
             request_params = {"messages": messages_payload, **config.completion_params}
             # Ensure caching is disabled only for this request (review feedback)
             request_params["cache"] = {"no-cache": True}
+
+            api_base = os.getenv("EP_LLM_API_BASE") or os.getenv("EP_LLM_BASE_URL")
+            if api_base and "api_base" not in request_params:
+                request_params["api_base"] = api_base
             # Single-level reasoning effort: expect `reasoning_effort` only
             effort_val = None