diff --git a/reasoning_gym/utils.py b/reasoning_gym/utils.py
index 41f0779d..c7d1b0d8 100644
--- a/reasoning_gym/utils.py
+++ b/reasoning_gym/utils.py
@@ -7,11 +7,13 @@ from typing import Any, Optional, Union
 SYSTEM_PROMPTS = {
     "DeepSeekZero": """A conversation between User and Assistant. The user asks a question, and the Assistant solves it.
 The assistant first thinks about the reasoning process in the mind and then provides the user with the answer. The reasoning process and answer are enclosed within <think> </think> and <answer> </answer> tags, respectively, i.e., <think> reasoning process here </think>
-<answer> answer here </answer>
+<answer>answer here</answer>
+Do not explain your reasoning inside the answer tags, provide only the final answer.
 """,
     "default": """Given a problem, your task is to answer the question by thinking step-by-step in a clear and specific manner.
 Once you have thought about the reasoning process, provide the answer in the following format:
-<answer> answer here </answer>
+<answer>answer here</answer>
+Do not explain your reasoning inside the answer tags, provide only the final answer.
 """,
 }